Digital Wavelength Locking for Synchronized Transceiver Lasers
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Solution Overview
Problem
Existing optical communication systems face challenges in maintaining stable and synchronized frequencies between transmit and receive lasers, which are often costly and require complex optical components like etalons and thermoelectric coolers, limiting their adoption in data centers.
Innovation Solution
A method for wavelength locking that uses digital signal processing to measure and adjust laser frequencies without etalons or thermoelectric coolers, employing digital band-pass filters and feedback loops to synchronize transmit and receive lasers, enabling precise frequency matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional optical components like etalons and thermoelectric coolers are used to synchronize laser frequencies, then frequency stability is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces mechanical/optical frequency stabilization components (etalons, thermoelectric coolers) with a digital signal processing system. The DSP measures frequency offsets by analyzing received optical signals and generates correction signals to adjust laser frequencies, eliminating the need for complex optical reference components while maintaining frequency synchronization.
Solution Approach 2:
The patent introduces digital signal processing as an intermediary between the transmit and receive lasers. The DSP acts as a mediator that measures frequency differences through signal analysis and translates them into correction commands, enabling frequency locking without direct optical component interaction.
2Device complexity
If digital signal processing is used to measure and adjust laser frequencies, then device complexity is reduced, but measurement precision may be affected
Solution Approach 1:
The patent implements a feedback loop where the DSP continuously measures the frequency offset between transmit and receive lasers by analyzing received signals, generates correction signals, and adjusts the laser frequencies. This closed-loop feedback mechanism ensures that frequency measurement accuracy is maintained despite the elimination of traditional optical reference components.
Data Source
AI summary
A system, method, an apparatus to change a frequency of a laser of a first transceiver based on a difference of a frequency of a laser of a second transceiver.