Multi-Wavelength Coherent Receiver Hardware Sharing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional digital signal processing (DSP) based optical coherent receivers are limited in detecting multiple optical wavelength channels simultaneously, which hinders efficient sharing and simplification of electro-optics and DSP hardware, increasing implementation costs.
Innovation Solution
A multi-wavelength coherent receiver design utilizing a tunable multi-wavelength local oscillator (MWLO) with a polarization-diversity optical hybrid module, PIN diodes, analog-to-digital converters, and digital signal processing (DSP) for chromatic dispersion compensation and time domain equalization, allowing simultaneous detection of multiple wavelength channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single coherent receiver is designed to detect multiple optical wavelength channels simultaneously, then hardware sharing and simplification is achieved, but the complexity of the receiver design increases
Solution Approach 1:
The patent implements a universal coherent receiver that can detect multiple optical wavelength channels simultaneously by using a single local oscillator with multiple wavelengths. This multi-functional design allows the same hardware components (photodetectors, ADCs, DSP) to process multiple WDM channels, achieving hardware sharing and simplification while maintaining the ability to handle different wavelength channels through digital signal processing separation
2Measurement precision
If multiple separate coherent receivers are used for each wavelength channel, then detection accuracy is maintained, but implementation cost increases
Solution Approach 1:
The patent merges multiple separate coherent receiver functions into a single integrated receiver. By combining multiple wavelength channels from a WDM signal into one receiver using a multi-wavelength local oscillator, the system achieves cost-effective implementation while maintaining detection accuracy through digital signal processing that separates and processes each channel independently
3Productivity
If a multi-wavelength local oscillator is used to lock to multiple channels simultaneously, then channel selection efficiency is improved, but frequency offset management becomes more complex
Solution Approach 1:
The patent employs feedback mechanisms in the digital signal processing to manage frequency offsets for multiple wavelength channels. The system continuously monitors and adjusts frequency offsets for each channel detected by the multi-wavelength local oscillator, enabling efficient channel selection and simultaneous locking to multiple channels while maintaining accurate frequency synchronization through adaptive feedback control
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
Enables efficient detection and processing of multiple wavelength channels using shared hardware, reducing implementation costs and maintaining frequency lock among local oscillators, thus enhancing the capability to handle WDM signals on both fixed and flexible grids.
Implementation Method 1
polarization-diversity optical hybrid module... split an optical signal into multiple polarization components
Implementation Method 2
polarization diversity optical hybrid mixes one of the plurality of multi-carrier optical signals with a reference source
Implementation Method 3
A plurality of detectors detects polarization components of the first channel wavelength... A plurality of PIN diodes coupled to the polarization-diversity optical hybrid module
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Embodiments are provided for a novel multi-wavelength coherent receiver (MWCR) design and operation capable of detecting multiple optical wavelength channels. The embodiments include an optical receiver comprising a polarization-diversity optical hybrid module, a multiple wavelength local oscillator (MWLO) coupled to an input of the polarization-diversity optical hybrid module, a plurality of PIN diodes coupled to the polarization-diversity optical hybrid module, a plurality of analog-to-digital converters (ADCs) coupled to the PIN diodes, and a digital signal processing (DSP) module coupled to the ADCs. The polarization-diversity optical hybrid module splits an optical signal into multiple polarization components, wherein the optical signal includes multiple channels at multiple wavelengths. The MWLO locks the optical signal to the multiple wavelengths of the channels simultaneously. The DSP combines the signals from the ADCs corresponding to the polarization components and detects the channels at the wavelengths.