Bidirectional Optical Transceiver Module Wavelength Segmentation
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Solution Overview
Problem
Bi-directional optical transceiver modules in CWDM single channels face link failures due to reflection and backscattering on optical lines, which reduces transmission efficiency and requires multiple optical terminal devices, increasing manufacturing and management complexities.
Innovation Solution
A bi-directional optical transceiver module with a thermoelectric semiconductor element for temperature adjustment and a reflected light-blocking optical filter unit that converts and filters optical signals, ensuring only pre-set wavelength signals are received, thereby blocking external reflections and improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single CWDM channel is used for bidirectional transmission, then optical line use efficiency is improved, but link reliability deteriorates due to reflection and backscattering
Solution Approach 1:
The single CWDM channel is segmented into two distinct wavelength bands: upstream wavelengths (λ1, λ2, ..., λ9) for subscriber-to-central-station transmission and downstream wavelengths (λ10, λ11, ..., λ18) for central-station-to-subscriber transmission. This wavelength segmentation eliminates interference between bidirectional signals while maintaining single-channel efficiency.
Solution Approach 2:
An optical filter is introduced as an intermediary component to separate and route different wavelength signals. The filter selectively transmits upstream wavelengths to the receiver while blocking downstream wavelengths, and vice versa, preventing reflection and backscattering interference between bidirectional communications.
2Reliability
If multiple optical terminal devices are deployed for different wavelengths, then wavelength-specific transmission reliability is improved, but device complexity and management difficulty increase
Solution Approach 1:
The optical terminal device is designed with multi-functionality to handle both upstream and downstream wavelengths simultaneously using a single integrated optical module. The device can receive upstream signals on wavelengths λ1-λ9 and downstream signals on wavelengths λ10-λ18 through the same physical interface, eliminating the need for multiple wavelength-specific terminal devices.
Solution Approach 2:
Multiple wavelength handling capabilities are merged into a single optical terminal device. The device integrates both upstream receiver and downstream receiver functions, along with the optical filter, into one unified module, simplifying manufacturing, deployment, and management while maintaining transmission reliability across all wavelengths.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances optical line transmission efficiency by separating wavelengths, minimizing link failures, and simplifying the optical network structure, reducing costs and complexities in installation and maintenance.
Implementation Method 1
a thermoelectric semiconductor element configured to perform a temperature adjustment of the optical transmission unit in response to an external temperature
Implementation Method 2
an optical filter configured to be provided on one surface of the platform to correspond to the through-hole, transmit light from the light-emitting element to an optical line, and transmit light input through the optical line to the light-receiving element
Implementation Method 3
The bi-directional optical transceiver module includes a parallel light lens configured to convert and output the reflected optical signals in a form of parallel light
Implementation Method 4
The reflected light-blocking optical filter unit may pass, as the reception signal, only a signal within a pre-set wavelength range including the wavelength allocated to the reception signal among the optical signals output through the parallel light lens so as to block the external reflected light
Data Source
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AI summary
Disclosed is a bi-directional optical transceiver module. The bi-directional optical transceiver module includes: an optical transmission unit configured to output a transmission signal; an optical reception unit configured to receive an input of a reception signal, the transmission signal and the reception signal having different wavelength values within a single channel; a splitter installed to be inclined with respect to an incident direction of the transmission signal output from the optical transmission unit to output the transmission signal to an outside and to reflect optical signals input from the outside; and a reflected light-blocking optical filter configured to pass, as a receiving signal, only an optical signal within a preset wavelength range including the wavelength value allocated to the reception signal among the optical signals reflected by the splitter so as to block external reflected light. The present disclosure may prevent a bi-directional optical transceiver module capable of preventing a link fail between optical communication networks according to reflection and backscattering on an optical line.