On-Chip Wavelength Controller for Precise Tunable Laser Locking
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Solution Overview
Problem
Current optical transceivers face challenges in achieving precise and flexible wavelength locking for lasers, particularly in high-speed optical fiber communications, as they often require off-chip solutions that compromise miniaturization and resource efficiency.
Innovation Solution
A wavelength controller for tunable lasers, integrated on-chip, utilizing an interferometer-based circuit and vector-based signal synthesizer to generate control signals for accurate wavelength tuning, reducing the need for photodiodes and enabling flexible, high-accuracy locking across a broad spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If off-chip wavelength locking is implemented, then wavelength control accuracy is improved, but device integration and miniaturization are compromised
Solution Approach 1:
The patent combines the wavelength controller and tunable laser onto a single chip, integrating previously separate off-chip components. This merging enables monolithic integration while maintaining wavelength locking functionality through on-chip interferometer-based circuits and vector-based signal synthesis.
Solution Approach 2:
The wavelength controller is designed with multi-functional capabilities including arbitrary wavelength locking, frequency offset compensation, and operation across broad spectral ranges. The vector-based signal synthesizer provides universal wavelength control that eliminates the need for multiple dedicated components.
2Volume of moving object
If traditional wavelength locking components are integrated on-chip, then miniaturization is achieved, but resource efficiency and component count increase
Solution Approach 1:
The patent extracts and eliminates redundant photodiodes from the traditional wavelength locking architecture. By using interferometer-based circuits that generate phase-shifted intensity values directly, the design removes the need for multiple separate photodiode detectors, reducing component count while maintaining functionality.
Solution Approach 2:
The interferometer-based circuit creates optical path copies that interfere constructively and destructively to generate intensity variations. This optical copying mechanism replaces the need for multiple physical photodiodes, as the interference pattern itself encodes the wavelength information.
3Adaptability or versatility
If arbitrary wavelength locking is implemented, then operational flexibility is improved, but calibration complexity increases
Solution Approach 1:
The patent implements preliminary calibration procedures that establish reference points for arbitrary wavelength locking. By pre-calibrating the vector-based signal synthesizer with known wavelength references, the system enables flexible tuning to any wavelength within the operating range without requiring complex real-time calibration during operation.
Solution Approach 2:
The wavelength controller incorporates feedback mechanisms that continuously monitor the laser wavelength and adjust control signals to maintain locking. The feedback loop uses the interferometer-derived intensity values to automatically correct wavelength drift, reducing the need for manual recalibration and improving operational flexibility.
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 provides improved laser stability and reduced interference, allowing for clearer and more reliable signal transmission with enhanced flexibility and resource efficiency, suitable for high-speed data transmission applications.
Implementation Method 1
an interferometer-based circuit configured to generate phase-shifted intensity values based on said input signal
Implementation Method 2
a vector-based signal synthesizer configured to generate a complex vector-based signal based on said phase-shifted intensity values
Data Source
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AI summary
The invention concerns a wavelength controller (100) for a tunable laser (10). The wavelength controller (100) is configured to receive an input signal and in response thereto generate a control signal for tuning the wavelength of the laser. The wavelength controller (100) is configured to receive at least part of the output of the laser (10) as an input signal. The wavelength controller (100) includes an interferometer-based circuit (110) configured to generate phase-shifted intensity values based on the input signal. The wavelength controller (100) includes a vector-based signal synthesizer (120) configured to generate a complex vector-based signal based on the phase-shifted intensity values and to compute at least one vector-representing quantity based on the complex vector-based signal. The vector-representing quantity or quantities is/are substantially linearly correlated with the wavelength. The wavelength controller (100) includes a control signal generator (130) configured to generate the control signal at least partly based on said at least one vector-representing quantity.