Tunable Laser Architecture Using Multi-Band Amplifiers and Vernier Filtering
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Solution Overview
Problem
The limited gain bandwidth of individual gain chips restricts the tunable range of wavelengths for laser tuning in tunable lasers, precluding the expansion of the free spectral range in silicon photonic chips.
Innovation Solution
A tunable laser design incorporating a channel selection assembly, multiple optical amplifiers, a micro-ring filtering assembly, and a reflection assembly, utilizing a vernier caliper effect to filter and resonate optical signals across different wavelength ranges, allowing for alternate use of optical amplifiers to expand the wavelength tuning range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single gain chip is used in the tunable laser, then the device complexity is reduced, but the wavelength tuning range is limited
Solution Approach 1:
The patent divides the gain function into multiple independent gain chips, each with different operation wavelength ranges. The channel selection assembly switches between these segmented gain chips to achieve extended wavelength tuning range while maintaining manageable device complexity through modular architecture.
Solution Approach 2:
The micro-ring filtering assembly and reflection assembly serve as universal components that work with multiple different gain chips. These components provide multi-functionality by handling filtering and resonance tasks across various wavelength ranges, reducing the need for dedicated components for each wavelength band.
2Adaptability or versatility
If multiple optical amplifiers with different operation wavelength ranges are used, then the wavelength tuning range is expanded, but the device complexity increases
Solution Approach 1:
The patent merges multiple gain chips with different operation wavelength ranges into a unified laser system. The channel selection assembly, micro-ring filtering assembly, and reflection assembly are combined to create an integrated structure that achieves extended wavelength tuning while sharing common components across different wavelength bands.
Solution Approach 2:
The channel selection assembly provides dynamic switching capability between different gain chips based on the desired wavelength range. This dynamic configuration allows the system to adapt its composition in real-time, selecting only the necessary components for the current operating wavelength, thereby managing complexity through conditional activation.
3Adaptability or versatility
If the gain bandwidth of individual gain chips is increased, then the wavelength tuning range is expanded, but the manufacturing precision requirements increase
Solution Approach 1:
Instead of requiring each gain chip to have an extremely broad gain bandwidth, the patent segments the wavelength range into multiple bands, with each gain chip optimized for a specific segment. This segmentation relaxes the manufacturing precision requirements for each individual gain chip while achieving the overall goal of wide wavelength tuning range through the combination of multiple specialized chips.
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 design effectively expands the wavelength range for laser tuning, enhancing the free spectral range and improving the stability and efficiency of optical scanning signals.
Implementation Method 1
The micro-ring filtering assembly is configured to filter the gain optical signal under the vernier caliper effect to obtain a filtered optical signal
Implementation Method 2
The reflection assembly is configured to output a part of the optical signal in the filtered optical signal outward, and reflect, after the remaining optical signals pass through the micro-ring filtering assembly, the remaining optical signals to an optical amplifier
Implementation Method 3
The optical amplifier is configured to output a gain optical signal to a micro-ring filtering assembly correspondingly coupled thereto under the drive of the driving electrical signal
Implementation Method 4
The first phase shifter is configured to adjust the resonant wavelength of the characteristic resonant cavity to be the same as the resonant wavelength of the micro-ring filter
Data Source
AI summary
A tunable laser includes: a channel selection assembly, a plurality of optical amplifiers, a micro-ring filtering assembly and a reflection assembly. The micro-ring filtering assembly is coupled to the reflection assembly, and operation wavelength ranges of the respective optical amplifiers are different. The channel selection assembly is used for selecting any optical amplifier to input a gain optical signal to the micro-ring filtering assembly. The micro-ring filtering assembly is used for filtering the gain optical signal under a vernier caliper effect to obtain filtered optical signals, and then inputting same into the reflection assembly. The reflection assembly is used for outputting some of the filtered optical signal outwards, and reflecting, after the remaining optical signals pass through the micro-ring filtering assembly, the remaining optical signals to an optical amplifier currently selected by the channel selection assembly.