# US 10,120,142 B2 · Optical transceiver module with dual band pass WDM coupler embedded therein

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,120,142 B2
- Document ID: US10120142B2
- Status: Granted
- Kind: B2
- Application number: 15/246,117
- Filed: 2016-08-24
- Published: 2017-03-02
- Granted: 2018-11-06
- Earliest claimed: 2015-08-24
- Assignees: Lightron Fiber-Optic Devices Inc.
- Applicants: Lightron Fiber-Optic Devices Inc
- Inventors: Dong-Hyun Lee; Jin-Soo Choi; Yoon-Koo Kwon
- Web page: https://patentgrep.com/patent/US10120142B2

## CPC

- G02B 6/4206: {Optical features (G02B6/4207, G02B6/421 take precedence)}
- G02B 6/00: Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B 6/29361: {Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters}
- G02B 6/2938: {for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM}
- G02B 6/32: having lens focusing means {positioned between opposed fibre ends (with lens being an integral part of the single fibre end G02B6/262)}
- G02B 6/4203: {Optical features}
- G02B 6/4215: {the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers (G02B6/4246 takes precedence)}
- G02B 6/4246: {Bidirectionally operating package structures}
- H04B 10/40: Transceivers
- H04J 14/0209: {Multi-stage arrangements, e.g. by cascading multiplexers or demultiplexers}
- H04J 14/0213: {Groups of channels or wave bands arrangements}
- H04B 10/071: using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04B: TRANSMISSION
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)

## Abstract

Provided is an optical transceiver module having a dual band pass WDM coupler embedded therein, wherein the dual band pass WDM coupler provides pass bands for selectively passing a transmission signal output from an optical transmitting unit, and an optical signal having a specific wavelength received by an optical receiving unit among optical signals input through a common port. According to the present invention, a size and cross-talk of the optical transceiver module may be reduced, and the optical transceiver module may be used as a video transceiver in an optical subscriber network according to an ITU-RG.983.3 standard.

## Claims

### Claim 1

An optical transceiver module having a dual band pass wavelength division multiplexing (WDM) coupler embedded therein, the optical transceiver module comprising:
the dual band pass WDM coupler including a common port, a C lens converting optical signals input to the common port into parallel light, a dual band pass WDM filter passing an optical signal having a specific wavelength among the optical signals converted into the parallel light by the C lens and reflecting optical signals having other wavelengths, and a reflection port allowing the optical signals reflected by the dual band pass WDM filter and concentrated by the C lens to be incident thereon and to be output therefrom;
an optical transmitting unit outputting a transmission signal;
a parallel light lens converting the transmission signal output from the optical transmitting unit into parallel light;
a WDM filter installed to be inclined with respect to a moving direction of the transmission signal converted into the parallel light by the parallel light lens, to thereby pass the transmission signal converted into the parallel light and reflect the optical signal having the specific wavelength passing through the dual band pass WDM filter; and
an optical receiving unit receiving the optical signal having the specific wavelength reflected by the WDM filter,
wherein the dual band pass WDM filter passes the transmission signal passing through the WDM filter, and the C lens concentrates the transmission signal passing through the dual band pass WDM filter to allow the concentrated transmission signal to be incident on the common port,
wherein the optical signal having the specific wavelength and the transmission signal have different wavelengths,
wherein the dual band pass WDM filter provides separate pass bands for selectively passing only the optical signal having the specific wavelength and the transmission signal.

### Claim 2 (depends on 1)

The optical transceiver module of claim 1, further comprising an optical filter unit for optical reception disposed between the WDM filter and the optical receiving unit to pass only an optical signal having a wavelength allocated to the optical receiving unit among the optical signals having the specific wavelength reflected by the WDM filter.

### Claim 3 (depends on 2)

The optical transceiver module of claim 2, further comprising a condensing lens concentrating the optical signals having the specific wavelength reflected by the WDM filter,
wherein the optical filter unit for optical reception is disposed between the condensing lens and the optical receiving unit to pass only the optical signal having the specific wavelength allocated to the optical receiving unit among the optical signals having the specific wavelength concentrated by the condensing lens.

### Claim 4 (depends on 3)

The optical transceiver module of claim 3, wherein the transmission signal output from the optical transmitting unit and incident on the common port has a wavelength of 1610 nm,
the optical signals input to the common port have wavelengths of 1270 nm, 1310 nm, 1490 nm, 1550 nm, and 1577.5 nm,
the optical signal passing through the dual band pass WDM filter and received by the optical receiving unit among the optical signals input to the common port has a wavelength of 1550 nm, and
the optical signals reflected by the dual band pass WDM filter and concentrated by the C lens to be incident on the reflection port and output from the reflection port have the wavelengths of 1270 nm, 1310 nm, 1490 nm, and 1577.5 nm.