Wavelength Auto-negotiation Using Non-tunable Optical Detectors
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Solution Overview
Problem
Existing optical communication systems, such as WDM systems, face challenges in efficiently identifying and adjusting to unknown input wavelengths for optimal signal transmission, often requiring tunable elements that slow down the wavelength negotiation process.
Innovation Solution
A system comprising a bank of non-tunable optical detectors and an input optical filter that routes the input signal to select an appropriate laser based on detection indications, allowing for rapid wavelength identification and selection without the need for tunable elements, using a single substrate and Silicon Photonics technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If tunable elements are used for wavelength identification and adjustment, then the system can adapt to unknown input wavelengths, but the wavelength negotiation process becomes slow
Solution Approach 1:
The system divides the wavelength detection function into multiple independent non-tunable detectors, each detecting a specific wavelength range. This segmentation allows parallel wavelength identification without requiring sequential tuning, thereby maintaining adaptability while improving negotiation speed.
Solution Approach 2:
The optical filter is pre-configured with fixed wavelength channels that correspond to possible input wavelengths. This preliminary arrangement of detection channels enables immediate wavelength identification upon signal arrival, eliminating the time required for dynamic tuning while preserving full wavelength adaptability.
2Speed
If non-tunable detectors are used with optical filtering, then wavelength negotiation speed increases, but the system requires multiple detectors and filters
Solution Approach 1:
Each optical detector is designed with a broad spectral response range, enabling it to detect multiple wavelength channels through the optical filter. This multi-functionality allows a smaller number of detectors to handle the same total wavelength range, reducing device complexity while maintaining fast negotiation speed.
Solution Approach 2:
The system combines multiple wavelength detection functions into a single integrated detection module where multiple detectors work in parallel under a unified control scheme. This merging approach reduces the overall number of discrete components and simplifies the system architecture while preserving rapid wavelength negotiation capability.
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 fast wavelength negotiation, typically below 1 millisecond, facilitating high-speed optical network switching and routing by automatically identifying and matching the input wavelength with an output wavelength, enhancing the efficiency of optical communication equipment.
Implementation Method 1
an input optical filter... configured to receive an input optical signal having an input wavelength, and to route the input optical signal to one of the optical detectors in the bank depending on the input wavelength
Implementation Method 2
a bank of optical detectors... configured to output respective detection indications in response to detecting a presence of an optical signal
Data Source
AI summary
An apparatus includes a bank of optical detectors, an input optical filter and a selector. The optical detectors are configured to output respective detection indications in response to detecting a presence of an optical signal. The input optical filter is configured to receive an input optical signal having an input wavelength, and to route the input optical signal to one of the optical detectors in the bank depending on the input wavelength. The selector is configured to select an output wavelength based on the detection indications of the optical detectors, and to cause generation and transmission of an output optical signal at the selected output wavelength.