Optical Comb Generator Phase Stability via Pre-Modulation
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Solution Overview
Problem
Conventional multiple wavelength signal generation devices, such as optical comb generators, produce lights with unstable phase relationships and limited information per wavelength component, making them inadequate for testing wavelength multiplexed communication systems effectively.
Innovation Solution
A multiple wavelength signal generation device incorporating an optical comb generator with an optical adjusting portion that includes a phase modulator, intensity modulator, or frequency modulator, allowing for phase, intensity, or frequency modulation of the input light to generate lights with more information and different optical frequencies, preventing light interference and enabling varied modulation patterns across wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional optical comb generators are used to generate multiple wavelength lights, then the apparatus structure can be simplified, but the phase relationships between wavelength components become unstable and light interference occurs within the loop
Solution Approach 1:
The invention segments the modulation function by introducing separate optical adjusting portions for different wavelength components. Each adjusting portion independently controls phase, intensity, or frequency for its assigned wavelength, preventing interference while maintaining simplicity. This segmentation allows stable phase relationships without requiring complex overall stabilization of the optical path.
Solution Approach 2:
The optical adjusting portions act as intermediaries between the light source and the optical comb generator loop. These intermediaries pre-modulate the wavelength components before they enter the loop, preventing interference issues while maintaining the simple apparatus structure. The intermediaries stabilize phase relationships without requiring complex feedback control of the entire optical path.
2Reliability
If unmodulated single light is used as input to prevent light interference in the optical comb generator, then light interference is prevented, but the information transmission capacity per wavelength component is limited
Solution Approach 1:
The invention applies preliminary modulation actions to the input light before it enters the optical comb generator loop. The optical adjusting portions pre-modulate phase, intensity, or frequency of wavelength components, so that when these modulated lights circulate in the loop, they do not interfere with each other. This preliminary action increases information capacity while maintaining reliability.
Solution Approach 2:
The invention changes the parameters of the input light by introducing optical adjusting portions that independently control phase, intensity, and frequency for different wavelength components. This parameter modulation increases the information transmission capacity of each wavelength component while the specific parameter adjustments prevent light interference within the loop, thus improving both information capacity and reliability.
3Ease of operation
If multiple wavelength lights with same modulation patterns are used for testing, then the testing can be performed, but the test cannot be deemed appropriate as it does not reflect real wavelength multiplexed system conditions
Solution Approach 1:
The invention applies different local qualities (modulation patterns) to different wavelength components through the optical adjusting portions. Each wavelength component can have its own specific modulation pattern, intensity, or phase characteristics, making the test more representative of real wavelength multiplexed systems while maintaining ease of operation through the modular adjusting portions.
Data Source
AI summary
A multiple wavelength signal generation device of the present invention is a multiple wavelength signal generation device having an optical comb generator for obtaining an input light and a group of lights shifted from the input light by predetermined frequencies; and an optical adjusting portion adjusting lights to be inputted to the optical comb generator; wherein the optical comb generator is composed of an optical fiber loop (105) which is provided with an optical SSB modulator (101), an optical amplifier (102) for compensating a conversion loss at the optical SSB modulator, an optical input port (103) for inputting lights from the light source, and an optical output port (104) for outputting lights, and the optical adjusting portion is composed of a phase modulator, an intensity modulator, or a frequency modulator.