Coherent Transceiver Wavelength Deviation Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Coherent optical transceivers in datacenter links face bandwidth limitations and high costs due to the need for precise wavelength control and synchronization, with existing technologies struggling to maintain laser wavelengths within tolerance ranges, especially in breakout configurations where multiple lasers are involved, leading to potential network failures and difficult failure analysis.
Innovation Solution
The implementation of coherent optical transceivers that utilize low-cost single-wavelength continuous wave lasers and include wavelength deviation detectors to monitor and adjust laser wavelengths, ensuring all modules operate within a common wavelength range, thereby maintaining network performance and reducing operational costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If coherent optical transceivers use multiple lasers in breakout configurations, then bandwidth and connectivity are improved, but wavelength synchronization difficulty and network reliability deteriorate
Solution Approach 1:
The patent implements feedback mechanisms where each transceiver monitors the wavelengths of other lasers in the network and provides feedback signals. The controller adjusts laser wavelengths based on this feedback to maintain synchronization within tolerance ranges, ensuring network reliability while enabling multi-laser breakout configurations for high bandwidth
Solution Approach 2:
The system dynamically changes the operating parameters (wavelengths) of multiple lasers to maintain synchronization. By adjusting wavelength parameters in real-time based on monitored deviations, the system enables multiple lasers to operate together reliably in breakout configurations
2Measurement precision
If coherent optical transceivers implement wavelength monitoring and adjustment mechanisms, then wavelength control precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions (wavelength monitoring, deviation detection, adjustment control) into an integrated controller within each transceiver. This merging of functions achieves precise wavelength control while reducing overall system complexity by eliminating the need for separate external monitoring and control devices
Solution Approach 2:
The controller is designed to perform multiple functions: monitoring local and remote wavelengths, detecting deviations, calculating correction signals, and adjusting laser parameters. This multi-functionality achieves precise wavelength control without adding proportional complexity, as one controller handles all wavelength management tasks
3Ease of manufacture
If coherent optical transceivers use low-cost narrow-tunable lasers, then manufacturing cost is reduced, but wavelength synchronization difficulty increases
Solution Approach 1:
The system performs preliminary wavelength adjustments during the link-up and initialization phase. By pre-synchronizing wavelengths before full operation begins, the system enables use of low-cost lasers that may have larger initial wavelength variations, while still achieving the required synchronization precision for coherent operation
Solution Approach 2:
Continuous feedback monitoring and adjustment compensates for the lower initial precision of low-cost lasers. The system monitors wavelength deviations in real-time and makes corrective adjustments, enabling cost-effective laser sources to achieve the required wavelength synchronization through active control
Data Source
AI summary
An optical communication system comprises a plurality of linked single-wavelength coherent optical transceivers configured to communicate via short-reach data-center links at a common reference wavelength, each transceiver including a single single-wavelength laser source that is used to produce a source beam at a source beam wavelength, the source beam being used to produce transmit beams sent by the transceiver and for mixing with one or more receive beams received by the transceiver; wherein each of the transceivers includes a thermo-electric cooler configured to control a temperature of the single-wavelength laser source around a temperature setpoint that locks the source beam wavelength to the common reference wavelength; wherein each transceiver includes a wavelength deviation detector configured to detect a wavelength deviation between the source beam wavelength and the wavelength or wavelengths of the one or more receive beams or between the source beam wavelength and the common reference wavelength, wherein the wavelength deviation detector is configured to detect a threshold amount of wavelength deviation that is indicative that the single-wavelength laser source is problematic or a single-wavelength laser source of a separate transceiver coupled to send the one or more receive beams is problematic, wherein each transceiver is configured to indicate the wavelength deviation or problematic characteristic in order to identify problematic laser sources and thereby prevent the linked network of transceivers from communicating at a linked network wavelength that is marginal or out-of-range in relation to the common reference wavelength.