Electronic Wavelength Controller for Laser Spectral Alignment
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Solution Overview
Problem
Optical networks face challenges in maintaining spectral alignment of laser sources across multiple wavelength channels, leading to issues like inter-channel interference and reduced reach limits due to filtering penalties and spontaneous detuning, which existing technologies struggle to address effectively.
Innovation Solution
An electronic control plane is implemented to orchestrate signal-filter spectral alignment, inter-channel spectral alignment, and spectral corrections for multiple laser sources, using an electronic wavelength controller that adjusts carrier frequencies based on performance metrics from optical receivers to optimize wavelength tuning and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser sources are tuned to maintain spectral alignment, then spectral alignment is improved, but device complexity increases due to need for electronic wavelength controllers and feedback systems
Solution Approach 1:
The patent implements feedback control by having optical receivers measure transmission performance metrics of optical data signals and feed this information back to electronic wavelength controllers. The controllers then adjust laser source wavelengths based on this feedback to maintain optimal spectral alignment, directly resolving the contradiction between achieving precise spectral alignment and managing control system complexity.
Solution Approach 2:
The system enables self-service by allowing the optical network to automatically monitor and adjust its own wavelength alignment without external intervention. The electronic wavelength controllers autonomously tune laser sources based on performance metrics collected from optical receivers, making the system self-correcting and reducing the need for manual calibration while maintaining high spectral alignment precision.
2Productivity
If multiple wavelength channels are transmitted to increase network capacity, then productivity is improved, but inter-channel interference increases due to spontaneous detuning and filtering penalties
Solution Approach 1:
The patent uses feedback control where optical receivers measure transmission performance metrics for each wavelength channel and feed this information to electronic wavelength controllers. The controllers adjust laser wavelengths to maintain optimal spacing and alignment, preventing inter-channel interference even as network capacity increases through additional wavelength channels.
Solution Approach 2:
The system dynamically changes the wavelength parameters of laser sources based on measured transmission performance. By adjusting wavelength positions and spacing in response to detected interference or detuning, the system maintains high network capacity while minimizing inter-channel interference through real-time parameter optimization.
Data Source
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AI summary
An optical network having a control plane provided with a capability to orchestrate and/or concertedly drive one or more of: signal-filter spectral alignment, inter-channel spectral alignment, and spectral corrections for multiple laser sources corresponding to different wavelength channels. In an example embodiment, the control plane includes an electronic wavelength controller configured to control small carrier-frequency corrections for a plurality of laser sources in response to the pertinent performance metrics collected from at least some of the optical receivers employed in the network. Some embodiments can be used to spectrally align an optical superchannel. Some embodiments may rely on the use of a cost function responsive to transmission performance of two or more different wavelength channels.