Bi-directional optical transceiver module

Patent metadata

Field	Value
Publication number	US-9838130-B2
Application number	US-201414546374-A
Country	US
Kind code	B2
Filing date	Nov 18, 2014
Priority date	May 18, 2012
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A bi-directional optical transceiver module includes: an optical transmission unit to output a transmission signal; an optical reception unit to receive a reception signal, the transmission signal and the reception signal having different corresponding first and second wavelength values within a single channel; a splitter, inclined with respect to an incident direction of the transmission signal output from the optical transmission unit, to transmit the transmission signal to an outside, and reflect optical signals input from the outside, the optical signals including the reception signal; and a reflected light-blocking optical filter unit to pass, as the reception signal among the optical signals reflected by the splitter, an optical signal within a preset wavelength range including the second wavelength value.

First claim

The invention claimed is:

1. A bi-directional optical transceiver module, comprising:
an optical transmission unit configured to output a transmission signal, wherein the transmission signal is an upstream signal having first wavelength value allocated within a single channel;
an optical reception unit configured to receive a reception signal, wherein the reception signal is a downstream signal having second wavelength value allocated within the single channel, and the first wavelength value and the second wavelength value are different each other allocated within the single channel, and
wherein the single channel is a central wavelength of a coarse wavelength division multiplexed channel;

a splitter inclined with respect to an incident direction of the transmission signal output from the optical transmission unit, and configured to
transmit the transmission signal having the first wavelength value allocated within the single channel to an outside through the single channel, and
reflect optical signals input from the outside, the optical signals including the reception signal having the second wavelength value allocated within the single channel;

a reflected light-blocking optical filter unit configured to
pass, as the reception signal among the optical signals reflected by the splitter, an optical signal within a preset wavelength range including the second wavelength value, la blocking an internal reflection signal and an external reflection signal and separating the first wavelength value of the transmitting signal existing within the single channel such that the optical signal corresponding to the reception signal having the second wavelength value is incident on the optical reception unit, wherein the optical signal is converted in a form of parallel light; and

a parallel light lens arranged between the splitter and the reflected light-blocking optical filter unit, and configured to convert and transmit the reflected optical signals in a form of the parallel light.

2. The bi-directional optical transceiver module of claim 1 , further comprising:
a thermoelectric semiconductor element configured to perform a temperature adjustment of the optical transmission unit in response to an external temperature.

3. The bi-directional optical transceiver module of claim 1 , wherein the parallel light lens includes an incident surface to receive the reflected optical signals, and a light emission surface to output the parallel light converted from the reflected optical signals, wherein the light emission surface is opposite to the incident surface, and flat in shape.

4. The bi-directional optical transceiver module of claim 3 , wherein the reflected light-blocking optical filter unit is attached to the light emission surface of the parallel light lens by a transparent ultraviolet (UV) epoxy.

5. The bi-directional optical transceiver module of claim 3 , wherein the reflected light-blocking optical filter unit is configured to be a film filter coated on the light emission surface of the parallel light lens.

6. The bi-directional optical transceiver module of claim 1 , wherein the optical reception unit includes:
a light reception lens,
a cap enclosing the light reception lens, and
a condensing lens mounted on the cap.

7. An optical communication system, comprising:
a plurality of bi-directional optical transceiver modules configured to transmit and receive a plurality of transmission signals and reception signals having different wavelength values allocated within a single channel, wherein the single channel is a central wavelength of a coarse wavelength division multiplexed channel; and
a multiplexer/demultiplexer connected to the plurality of bi-directional optical transceiver modules, and configured to multiplex or demultiplex the plurality of transmission signals and reception signals having different wavelengths,
wherein each of the bi-directional optical transceiver modules comprises:
an optical transmission unit configured to output a transmission signal, wherein the transmission signal is an upstream signal having first wavelength value allocated within the single channel;
an optical reception unit configured to receive a reception signal, wherein, wherein the reception signal is a downstream signal having second wavelength value allocated within the single channel, and the first wavelength value and the second wavelength value are different each other allocated within the single channel;
a reflected light-blocking optical filter unit configured to
pass, as the reception signal among optical signals, an optical signal within a preset wavelength range including the second wavelength value, by blocking an internal reflection signal and an external reflection signal and separating the first wavelength value of the transmitting signal existing within the single channel such that the optical signal corresponding to the reception signal having the second wavelength value is incident on the optical reception unit, wherein the optical signal is converted in a form of parallel light; and

a parallel light lens arranged between the splitter and the reflected light-blocking optical filter unit, and configured to convert and transmit the reflected optical signals in a form of the parallel light.

8. The optical communication system of claim 7 , wherein said each of the bi-directional optical transceiver modules further comprises:
a splitter inclined with respect to an incident direction of the transmission signal output from the optical transmission unit, and configured to
transmit the transmission signal having the first wavelength value allocated within the single channel to an outside,
reflect the optical signals including the reception signal having the second wavelength value allocated within the single channel input from the outside, and
transmit the optical signals to the reflected light-blocking optical filter unit.

9. The optical communication system of claim 7 , wherein said each of the bi-directional optical transceiver modules further comprises:
a thermoelectric semiconductor element configured to perform a temperature adjustment of the optical transmission unit in response to an external temperature.

Assignees

• Sk Telecom Co Ltd
• Lightron Inc

Inventors

• Kim Hongman
• Hwang Wolyon
• Heo Youngun
• Kwon Yoonkoo
• Choi Jinsoo
• Jung Kangyong
• Jin Jaehyun
• Yoo Youngjoon
• Sung Jinsoo
• Lim Jongyeong
• Park Sangsu

Classifications

• H04J14/0279

  WDM point-to-point architectures · CPC title

• G02B6/4263

  of the transisitor outline [TO] can type · CPC title

• G02B6/4215

  the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers (G02B6/4246 takes precedence) · CPC title

• H04B10/2589

  Bidirectional transmission · CPC title

• H04J14/0265

  Multiplex arrangements in bidirectional systems, e.g. interleaved allocation of wavelengths or allocation of wavelength groups · CPC title