U.S. patent application number 17/385871 was filed with the patent office on 2022-05-05 for optical transceiver.
This patent application is currently assigned to DZS Inc.. The applicant listed for this patent is DZS Inc.. Invention is credited to Jae Goo Kim, Seung Dong Lee.
Application Number | 20220140932 17/385871 |
Document ID | / |
Family ID | |
Filed Date | 2022-05-05 |
United States Patent
Application |
20220140932 |
Kind Code |
A1 |
Lee; Seung Dong ; et
al. |
May 5, 2022 |
OPTICAL TRANSCEIVER
Abstract
An optical transceiver of the present invention includes a
coexistence element therein. An optical signal according to a first
standard and an optical signal according to a second standard are
transmitted and received through an optical cable accommodated in a
first receptacle of the optical transceiver, and in the coexistence
element, the optical signal according to the first standard and the
optical signal according to the second standard are
divided/combined. Among the divided upstream optical signals, the
optical signal according to the first standard is photoelectrically
converted in the optical transceiver, and the optical signal
according to the second standard is transmitted to the outside
through an optical cable accommodated in a second receptacle.
Inventors: |
Lee; Seung Dong; (Fremont,
CA) ; Kim; Jae Goo; (Suwon-si, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
DZS Inc. |
Plano |
TX |
US |
|
|
Assignee: |
DZS Inc.
Plano
TX
|
Appl. No.: |
17/385871 |
Filed: |
July 26, 2021 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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63110238 |
Nov 5, 2020 |
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International
Class: |
H04J 14/02 20060101
H04J014/02; H04B 10/40 20060101 H04B010/40; H04Q 11/00 20060101
H04Q011/00 |
Claims
1. An optical transceiver comprising: a first receptacle which
accommodates an optical cable through which an upstream optical
signal in which a reception wavelength optical signal according to
a first standard and a reception wavelength optical signal
according to a second standard coexist, and a downstream optical
signal, in which a transmission wavelength optical signal according
to the first standard and a transmission wavelength optical signal
according to the second standard coexist, are transmitted; a second
receptacle which accommodates an optical cable through which the
reception wavelength optical signal according to the second
standard and the transmission wavelength optical signal according
to the second standard are transmitted; a coexistence element which
divides an optical path of the reception wavelength optical signal
according to the first standard and the reception wavelength
optical signal according to the second standard which are received
through the optical cable accommodated in the first receptacle,
transmits the reception wavelength optical signal according to the
second standard through the optical cable accommodated in the
second receptacle, changes an optical path of the transmission
wavelength optical signal according to the second standard received
through the optical cable accommodated in the second receptacle,
and transmits the transmission wavelength optical signal according
to the second standard through the optical cable accommodated in
the first receptacle; and a first standard optical signal converter
which photoelectrically converts the reception wavelength optical
signal according to the first standard transmitted from the
coexistence element and electro-optically converts a signal for
data to be transmitted to the transmission wavelength optical
signal according to the first standard,
2. The optical transceiver of claim 1, wherein the coexistence
element includes: a housing; a wavelength division multiplexing
(WDM) filter through which the reception wavelength optical signal
according to the first standard and the transmission wavelength
optical signal according to the first standard pass and which
reflects the reception wavelength optical signal according to the
second standard and the transmission wavelength optical signal at a
preset angle; and an optical path change part which includes a
first mirror and a second mirror, transmits an optical signal
received through the first receptacle and reflected by the WDM
filter to an outside through the second receptacle, and transmits
an optical signal received through the second receptacle and
reflected by the WDM filter to the outside through the first
receptacle.
Description
CROSS-REFERENCE TO RELATED APPLICATION(S)
[0001] This application claims priority from U.S. Patent
Application No. 63/072,177, filed on Aug. 30, 2020, in the United
States Patent and Trademark Office, the disclosure of which is
incorporated herein by reference in its entirety.
BACKGROUND
1. Field
[0002] The following description relates to an optical
transceiver.
2. Description of Related Art
[0003] Subscriber network technologies using optical cable media
are divided into active optical network technologies and passive
optical network (PON) technologies. In the is active optical
network, an apparatus such as an Ethernet switch or router, which
is a device for dividing an optical signal, needs power, and the
PON divides an optical signal using a splitter which does not need
power.
[0004] The PON is classified into a time division multiplexing
(TDM)-PON, a wavelength division multiplexing (WDM)-PON, and a time
and wavelength division multiplexing (TWDM)-PON according to a
multiplexing method of an upstream signal.
[0005] G-PON is a technology designed for simultaneously supporting
an asynchronous transfer mode (ATM) and Ethernet and complies with
the International Telecommunication Union (ITU)-Telecommunication
Standardization Sector (T) G.984 standard. G-PON is an abbreviation
of Gigabit-capable PON as a technology that supports an
upstream/downstream transmission rate of 1.25 Gbps. E-PON is an
abbreviation of Ethernet-PON as an Ethernet-specific technology and
complies with the Institute of Electrical and Electronics Engineers
(IEEE) 802.3ah Ethernet in the first mile (EFM) standard.
[0006] XG-PON and XGS-PON are successor technologies of G-PON and
are designed for supporting 10 Gbps. The XG-PON supports asymmetric
transmission rates of downstream 10 Gbps and upstream 1 Gbps and
complies with the ITU-T G.987 standard, and the XGS-PON supports a
symmetric transmission rate of upstream/downstream 10 Gbps and
complies with the ITU-T G.988 standard.
[0007] The PON includes an optical line terminal (OLT), a splitter,
an optical network unit (ONU), and an optical network terminal (ONT
among which the OLT transmits downstream traffic signals to
subscribers in a broadcasting manner, collects upstream traffic
signals transmitted from the ONT, and transmits the collected
upstream traffic signals to the Internet network at the same
time.
[0008] Various PON standards are used, and particularly, optical
signals of different wavelengths may be transmitted through a
single optical cable using WDM. In this case, an optical add-drop
multiplexing technique is generally used. A device (for example,
coexistence element (CEx) which performs an optical add-drop
multiplexing function is installed on an optical transmission path.
For example, in a case in which the XGS-PON is introduced to
replace the G-PON in a transmission network in which the G-PON is
established, there is a problem in that a device which performs the
optical add-drop multiplexing function should be additionally
installed.
SUMMARY
[0009] The proposed invention is directed to providing an optical
transceiver which performs an optical add-drop multiplexing
function in a case in which optical signals according to two
standards are simultaneously transmitted through one optical
cable.
[0010] In one aspect of the present invention, an optical
transceiver includes a first receptacle, a second receptacle, a
coexistence element, and a first standard optical signal
converter.
[0011] The first receptacle may accommodate an optical cable
through which an upstream optical signal in which a reception
wavelength optical signal according to a first standard and a
reception wavelength optical signal according to a second standard
coexist and a downstream optical signal, in which a transmission
wavelength optical signal according to the first standard and a
transmission wavelength optical signal according to the second
standard coexist, are transmitted.
[0012] The second receptacle may accommodate an optical cable
through which the reception wavelength optical signal according to
the second standard and the transmission wavelength optical signal
according to the second standard are transmitted.
[0013] The coexistence element may divide an optical path of the
reception wavelength optical signal according to the first standard
and the reception wavelength optical signal according to the second
standard which are received through the optical cable accommodated
in the first receptacle, transmit the reception wavelength optical
signal according to the second standard through the optical cable
accommodated in the second receptacle, change an optical path of
the transmission wavelength optical signal according to the second
standard received through the optical cable accommodated in the
second receptacle, and transmit the transmission wavelength optical
signal according to the second standard through the optical cable
accommodated in the first receptacle.
[0014] The first standard optical signal converter may
photoelectrically convert the reception wavelength optical signal
according to the first standard transmitted from the coexistence
element and electro-optically convert a signal for data to be
transmitted to the transmission wavelength optical signal according
to the first standard.
[0015] The coexistence element may include a housing, a wavelength
division multiplexing (WDM) filter, and an optical path change part
including a first mirror and a second mirror.
[0016] The WDM filter may allow the reception wavelength optical
signal according to the first standard and the transmission
wavelength optical signal according to the first standard to pass
therethrough and reflect the reception wavelength optical signal
according to the second standard and the transmission wavelength
optical signal at a preset angle.
[0017] The optical path change part including a first mirror and a
second mirror may transmit an optical signal received through the
first receptacle and reflected by the WDM filter to an outside
through the second receptacle and transmit an optical signal
received through the second receptacle and reflected by the WDM
filter to the outside through the first receptacle.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] FIG. 1 is a view showing an example of a related art for
processing an optical signal in which an XGS-passive optical
network (PON) standard and a G-PON transmission standard
coexist.
[0019] FIG. 2 is a view showing an example of processing optical
signals in which an XGS-PON signal and a G-PON signal coexist
through an optical line terminal (OLT) in which an optical
transceiver of the present invention is installed.
[0020] FIG. 3 is a view showing an example of processing optical
signals in which a 10G-EthernetPON (EPON) signal and an
Ethernet-PON (E-PON) signal coexist through an OLT in which the
optical transceiver of the present invention is installed.
[0021] FIG. 4 is a block diagram illustrating an optical
transceiver according to one aspect of the present invention.
[0022] FIG. 5 is a view illustrating an optical path of an optical
signal according to a first standard through a coexistence element
according to one aspect of the present invention.
[0023] FIG. 6 is a view illustrating an optical path of an optical
signal according to a second standard through the coexistence
element according to one aspect of the present invention.
[0024] FIG. 7 is a view illustrating an example of the optical
transceiver according to one aspect of the present invention.
DETAILED DESCRIPTION
[0025] The above-described and additional aspects of the present
invention will be realized from embodiments described with
reference to the accompanying drawings. It is understood that
components in the embodiments may be variously combined in one
embodiment as long as there are no contradictory statements
therebetween. Although a block of a block diagram may denote
physical components in some cases, the block may denote a partial
function of one physical component or may logically denote a
function performed by a plurality of components in other cases. In
some cases, the substance of a block or a part of the block may be
a set of program commands. Some or all of the blocks may be
realized by hardware, software, or a combination thereof.
[0026] An optical transceiver is a device, which performs a
function of transmitting an optical signal and a function of
receiving an optical signal at the same time as a single device,
converts an electrical signal to an optical signal, transmits the
converted optical signal through an optical cable, and converts an
optical signal received through the optical cable to an electrical
signal in an optical communication device such as an optical line
terminal (OLT). An optical transceiver of the present invention may
transmit and receive optical signals according to two standards
using wavelength division multiplexing (WDM) technology.
[0027] FIG. 1 is a view showing an example of a related art for
processing an optical signal in which an optical signal according
to an XGS-passive optical network (PON) standard and an optical
signal according to a G-PON transmission standard coexist. As
illustrated in FIG. 1, a transmission network including an XGS-PON
optical network terminal (ONT)#1 13-1 and an XGS-PON OLT#1 10-1
uses an XGS-PON transmission standard which supports both
downstream/upstream transmission speeds of 10 Gbps, and a
transmission network including an XGS-PON ONT#2 13-2, a
Gigabit-capable (G)-PON ONT#3 14, an XGS-PON OLT #2 10-2, and a
G-PON OLT#3 11 uses both of the XGS-PON transmission standard and
the G-PON transmission standard. An XGS-PON upstream signal
(optical signal of a wavelength of 1270 nm) of the XGS-PON ONT#2
13-2 and a G-PON upstream signal (optical signal of a wavelength of
1310 nm) of the G-PON ONT#3 14 are combined in a splitter and
transmitted, the combined optical signal is divided in a device
(for example, coexistence element (CEx) 12) which performs an
optical add-drop multiplexing function, the XGS-PON upstream signal
is transmitted to the XGS-PON OLT#2 10-2, and the G-PON upstream
signal is transmitted to the G-PON OLT#3 11. Conversely, an XGS-PON
downstream signal (optical signal of a wavelength of 1577 nm) from
the XGS-PON OLT#2 10-2 and a G-PON downstream signal (optical
signal of a wavelength of 1490 nm) from the G-PON OLT#3 11 are
combined by the CEx 12 and transmitted.
[0028] FIG. 2 is a view showing an example of processing an optical
signal in which an XGS-PON signal and a G-PON signal coexist
through an OLT in which an optical transceiver of the present
invention is installed. As illustrated in FIG. 2, a transmission
network including an XGS-PON ONT#4 23, a G-PON ONT#5 24, an XGS-PON
OLT#4 20, and a G-PON OLT#5 21 uses both of an XGS-PON transmission
standard and a G-PON transmission standard. An XGS-PON upstream
signal (optical signal of a wavelength of 1270 nm) of the XGS-PON
ONT#4 23 and a G-PON upstream signal (optical signal of a
wavelength of 1310 nm) of the G-PON ONT#5 24 are combined by a
splitter and transmitted, the combined optical signal is divided by
the optical transceiver of the present invention installed in the
XGS-PON OLT#4, the XGS-PON upstream signal is processed by the
corresponding OLT, and the G-PON upstream signal is transmitted to
the G-PON OLT#5 21 through an optical cable disposed between and
connected to the two OLTs. Conversely, a downstream signal (optical
signal of a wavelength of 1490 nm) of the G-PON OLT#5 21 is
transmitted to the optical transceiver of the present invention
installed in the XGS-PON OLT#4 20, combined with an XGS-PON
downstream signal (optical signal of a wavelength of 1577 nm), and
transmitted. Although not illustrated in FIG. 2, the optical
transceiver of the present invention has an optical add-drop
multiplexing function therein to divide optical signals according
to two different standards and combine optical signals according to
two different standards. Accordingly, a separate CEx does not need
to be installed on an optical transmission path.
[0029] FIG. 3 is a view showing an example of processing an optical
signal in which a 10G-EthernetPON (EPON) signal and an Ethernet-PON
(E-PON) signal coexist through an OLT in which the optical
transceiver of the present invention is installed. As illustrated
in FIG. 3, a transmission network including a 10G-EPON ONT#6 33, an
E-PON ONT#7 34, a 10G-EPON OLT#4 30, and an E-PON OLT#7 31 uses
both of a 10G-EPON transmission standard and an E-PON transmission
standard. A 10G-EPON upstream signal (optical signal of a
wavelength of 1270 nm) of 10G-EPON ONT#6 33 and an E-PON upstream
signal (optical signal of a wavelength of 1310 nm) of the E-PON
ONT#7 34 are combined in a splitter and transmitted, the combined
optical signal is divided by the optical transceiver of the present
invention installed in the 10G-EPON OLT#6, the 10G-EPON upstream
signal is processed in the corresponding OLT, and the E-PON
upstream signal is transmitted to the E-PON OLT#7 31 through an
optical cable disposed between and connected to two OLTs.
Conversely, a downstream signal (optical signal of a wavelength of
1490 nm) of the E-PON OLT#7 31 is transmitted to the optical
transceiver of the present invention installed in the 10G-EPON
OLT#6 30 and combined with a 10G-EPON downstream signal (optical
signal of a wavelength of 1577 nm) and transmitted. Although not
illustrated in FIG. 3, the optical transceiver of the present
invention has an optical add-drop multiplexing function therein to
divide optical signals according to two different standards and
combine optical signals according to two different standards. Like
an example of FIG. 2, a separate CEx does not need to be installed
on an optical transmission path.
[0030] FIG. 2 is a view illustrating that the optical transceiver
of the present invention processes the optical signals in which the
XGS-PON signal and the G-PON signal coexist, FIG. 3 is a view
illustrating that the optical transceiver of the present invention
processes the optical signals in which the 10G-EPON signal and the
E-PON signal coexist, but the optical transceiver of the present
invention is not limited to the case of the optical signal in which
the XGS-PON signal and the G-PON signal coexist and the case of the
optical signal in which the 10G-EPON and the E-PON signal coexist,
and can process optical signals according to various combinations
of PON standards including the two cases.
[0031] FIG. 4 is a block diagram illustrating an optical
transceiver according to one aspect of the present invention. An
optical transceiver 100 according to one aspect of the present
invention include a first receptacle 110, a second receptacle 130,
a coexistence element 150, and a first standard optical signal
converter 170.
[0032] The optical transceiver 100 of the present invention is
capable of bidirectional transmission using one optical cable and
may be a small form-factor pluggable (SFP) or SFP+type optical
transceiver. However, the present invention is not limited thereto,
the optical transceiver 100 of the present invention may be one of
various types, which satisfy a microservice architecture (MSA), of
optical transceivers. The optical transceiver 100 of the present
invention includes the first receptacle 110 and the second
receptacle 130 which are inductor-capacitor (LC) receptacles. An
optical cable is included in each of the two receptacles of the
optical transceiver 100 of the present invention, signals, in which
an optical signal according to a first standard and an optical
signal according to a second standard coexist, are transmitted to
and received from OLTs through one optical cable, and an optical
signal according to the second standard is transmitted to and
received from the optical transceiver accommodated in one port of
another OLT (which processes the optical signal according to the
second standard) through another optical cable. The first standard
and the second standard may be different standards among various
PON standards. For example, each of the first standard and the
second standard may be any one among various standards including an
XGS-PON standard, an XG-PON standard, a G-PON standard, an E-PON
standard, a 10G-EPON standard, a next-generation (NG)-PON2
standard, and the like. In the present invention, an example, in
which the first standard is the XGS-PON standard and the second
standard is the G-PON standard, will be described for the sake of
convenience of description.
[0033] The first receptacle 110 is an LC receptacle and
accommodates an optical cable. The first receptacle 110
accommodates the optical cable through which an upstream optical
signal, in which a reception wavelength optical signal according to
the first standard and a reception wavelength optical signal
according to the second standard coexist, and a downstream optical
signal, in which a transmission wavelength optical signal according
to the first standard and a transmission wavelength optical signal
according to the second standard coexist, are transmitted. As an
example, the optical transceiver 100 of the present invention may
receive an upstream optical signal of a wavelength of 1270 nm
according to the XGS-PON standard and an upstream optical signal of
a wavelength of 1310 nm according to the G-PON standard and
transmit a downstream optical signal of a wavelength of 1577 nm
according to the XGS-PON standard and a downstream optical signal
of a wavelength of 1490 nm according to the G-PON standard through
the optical cable accommodated in the first receptacle 110.
[0034] The second receptacle 130 is an LC receptacle and
accommodates an optical cable. The second receptacle 130
accommodates the optical cable through which the reception
wavelength optical signal according to the second standard and the
transmission wavelength optical signal according to the second
standard are transmitted. The other end of the optical cable
accommodated in the second receptacle 130 is accommodated in the
optical transceiver according to the second standard accommodated
in the OLT which is capable of processing the optical signal
according to the second standard and processes the optical signal
according to the second standard. As another example, in a case in
which the OLT, in which the optical transceiver 100 of the present
invention is installed, is an OLT capable of processing optical
signals according to both of two standards, the other end of the
optical cable accommodated in the second receptacle 130 may be
accommodated in the optical transceiver according to the second
standard accommodated in the other port.
[0035] The coexistence element divides upstream optical signals
according to two different standards or combines downstream optical
signals according to two different standards transmitted through
one optical cable and transmits the divided upstream optical
signals or the combined downstream optical signal through the
optical cable. In the related art, a coexistence element is formed
and used as a separate device, but in the present invention, the
optical transceiver 100 is used by including a corresponding
function therein. The coexistence element 150 may include a
coupling part to which the first receptacle 110 and the second
receptacle 130 are coupled.
[0036] The coexistence element 150 divides an upstream optical
signal, in which two different wavelengths coexist, into upstream
optical signals having different optical paths according to the
wavelengths and combines optical signals having two different
wavelengths to generate a downstream optical signal in which two
different wavelengths coexist using optical properties. The
coexistence element 150 of the present invention separates an
optical path of a reception wavelength optical signal according to
the first standard and an optical path of a reception wavelength
optical signal according to the second standard received through
the optical cable accommodated in the first receptacle 110,
transmits the reception wavelength optical signal according to the
second standard to the optical transceiver according to the second
standard through the optical cable accommodated in the second
receptacle 130, and transmits the optical signal according to the
first standard to the first standard optical signal converter
170.
[0037] In addition, the coexistence element 150 changes an optical
path of the transmission wavelength optical signal according to the
second standard received from the optical transceiver according to
the second standard through the optical cable accommodated in the
second receptacle 130 and transmits the transmission wavelength
optical signal according to the second standard with the
transmission wavelength optical signal according to the first
standard transmitted from the optical signal converter according to
the second standard through the optical cable accommodated in the
first receptacle 110.
[0038] As an example, in a case in which the optical transceiver
100 of the present invention transmits and receives an XGS-PON
optical signal and a G-PON optical signal, the coexistence element
receives an upstream optical signal of a wavelength of 1270 nm
according to the XGS-PON standard and an upstream optical signal of
a wavelength of 1310 nm according to the G-PON standard through the
optical cable accommodated in the first receptacle 110, transmits
the optical signal of the wavelength of 1270 nm to the first
standard optical signal converter 170, changes an optical path of
the optical signal of the wavelength of 1310 nm, and transmits the
optical signal of the wavelength of 1310 nm to the outside (an
optical transceiver according to the second standard) through the
optical cable accommodated in the second receptacle 130.
[0039] The first standard optical signal converter 170 includes an
avalanche photo diode (APD) and photoelectrically converts and
outputs a reception wavelength optical signal according to the
first standard transmitted from the coexistence element. In
addition, the first standard optical signal converter 170 includes
an external electro-absorption modulated laser (EML),
electro-optically converts an electrical signal for data to be
transmitted to a transmission wavelength optical signal according
to the first standard, and outputs the converted transmission
wavelength optical signal according to the first standard.
[0040] The coexistence element 150 may include a housing 151, a WDM
filter 153, and an optical path change part including a first
mirror 155 and a second mirror 157.
[0041] All of the WDM filter 153, the first mirror 155, and the
second mirror 157 are accommodated in the housing 151.
[0042] The WDM filter 153 is positioned on an optical path through
which an optical signal received from the optical cable
accommodated in the first receptacle 110 is transmitted to the
first standard optical signal converter 170, allows optical signals
having some wavelengths to pass therethrough, and reflects optical
signals having the other wavelengths. The WDM filter 153 allows a
reception wavelength optical signal according to the first standard
and a transmission wavelength optical signal according to the first
standard to pass therethrough and reflects a reception wavelength
optical signal and a transmission wavelength optical signal
according to the second standard at a preset angle.
[0043] The optical path change part includes the first mirror 155
and the second mirror 157. In the optical path change part, an
optical signal, which is received through the first receptacle 110
and reflected by the WDM filter 153, is sequentially reflected by
the first mirror 155 and the second mirror 157 to be transmitted to
the outside through the second receptacle 130. In addition, in the
optical path change part, an optical signal received through the
second receptacle 130 is sequentially reflected by the second
mirror 157, the first mirror 155, and the WDM filter 153 and
transmitted to the outside through the first receptacle 110.
[0044] FIG. 5 is a view illustrating an optical path of an optical
signal according to the first standard through the coexistence
element according to one aspect of the present invention. As
illustrated in FIG. 5, a concept is illustrated in which a
reception wavelength optical signal according to the first standard
received through the optical cable accommodated in the first
receptacle 110 passes through the WDM filter 153 and is transmitted
to the first standard optical signal converter 170, and a
transmission wavelength optical signal according to the first
standard output from the first standard optical signal converter
170 passes through the WDM filter 153 and is transmitted to the
outside through the optical cable accommodated in the first
receptacle 110. As an example, in a case in which the first
standard is the XGS-PON standard, an upstream optical signal of a
wavelength of 1270 nm passes through the WDM filter 153, and a
downstream optical signal of a wavelength of 1577 nm passes through
the WDM filter 153.
[0045] FIG. 6 is a view illustrating an optical path of an optical
signal according to the second standard through the coexistence
element according to one aspect of the present invention. As
illustrated in FIG. 6, a reception wavelength optical signal
according to the second standard received through the optical cable
accommodated in the first receptacle 110 is reflected by the WDM
filter 153, directed to the first mirror 155, reflected by the
first mirror 155 and the second mirror 157, and transmitted to the
outside through the optical cable accommodated in the second
receptacle 130, and a transmission wavelength optical signal
according to the second standard received through the optical cable
accommodated in the second receptacle 130 is reflected by the
second mirror 157 and the first mirror 155, reflected by the WDM
filter 153 again, and transmitted to the outside through the
optical cable accommodated in the first receptacle 110. As an
example, in a case in which the second standard is the G-PON
standard, an upstream optical signal of a wavelength of 1310 nm is
sequentially reflected by the WDM filter 153, the first mirror 155,
and the second mirror 157 and transmitted to the outside through
the optical cable accommodated in the second receptacle 130, and a
downstream optical signal of a wavelength of 577 nm is received
through the second receptacle 130, sequentially reflected by the
second mirror 157, the first mirror 155, and the WDM filter 153,
and transmitted to the outside through the optical cable
accommodated in the first receptacle 110.
[0046] FIG. 7 is a view illustrating an example of the optical
transceiver according to one aspect of the present invention. An
optical transceiver 100 illustrated in FIG. 7 is an example of an
SFP or SFP+type optical transceiver. The optical transceiver 100
may include a first receptacle 110 and a second receptacle 130
which are two LC receptacles and two optical cables. Signals which
pass through ONTs and in which an optical signal according to a
first standard and an optical signal according to a second standard
coexist may be transmitted and received through the optical cable
accommodated in the first receptacle 110, and the optical signal
according to the second standard may be transmitted and received
through the optical cable accommodated in the second receptacle
130.
[0047] In an upstream optical signal passing through the first
receptacle 110, a reception wavelength optical signal according to
the first standard and a reception wavelength optical signal
according to the second standard coexist, an optical path is
divided through a coexistence element 150, the reception wavelength
optical signal according to the first standard is directed to a
first standard optical signal converter 170, and the reception
wavelength optical signal according to the second standard passes
through the second receptacle 130 and is transmitted to the
outside.
[0048] The coexistence element 150 includes a WDM filter 153, a
first mirror 155, and a second mirror 157. The WDM filter 153
allows transmission and reception wavelength optical signals
according to the first standard to pass therethrough and reflects
the transmission and reception wavelength optical signals according
to the second standard. The WDM filter 153, the first mirror 155,
the second mirror 157 are installed to have is specific angles so
that the reception wavelength optical signal according to the
second standard passing through the first receptacle 110 passes
through the second receptacle 130 and is transmitted to the
outside, and the transmission wavelength optical signal according
to the second standard passing through the second receptacle 130
passes through the first receptacle 110 and is transmitted to the
outside.
[0049] The first standard optical signal converter 170 includes an
APD and photoelectrically converts and outputs the reception
wavelength optical signal according to the first standard
transmitted from the coexistence element 150. In addition, the
first standard optical signal converter 170 includes an external
EML, electro-optically converts an electrical signal for data to be
transmitted to a transmission wavelength optical signal according
to the first standard, and outputs the converted transmission
wavelength optical signal according to the first standard. The
first standard optical signal converter 170 may further include a
collimator lens, an optical filter which changes an optical path of
a reception wavelength optical signal, and an isolator. Since the
collimator lens, the optical filter, and the isolator are the same
as those included in an optical transceiver of the related art,
detailed descriptions will be omitted.
[0050] According to an optical transceiver of the present
invention, optical signals according to two transmission standards
can be processed by dividing or combining the optical signals
according to each standard even when a device which performs an
optical add-drop multiplexing function is not installed on an
external optical transmission path.
[0051] Although the present invention has been described with
reference to the accompanying drawings described above, the present
invention is not limited thereto and should be construed as
encompassing various modifications which may be clearly derived
therefrom by those skilled the art. The claims are intended to
encompass the various modifications.
* * * * *