Wavelength Selective Optical Cross-Connect Switch
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Solution Overview
Problem
Current optical communications systems face challenges in efficiently routing and managing multiple wavelength channels due to the complexity of demultiplexing, rerouting, and remultiplexing processes, particularly in achieving non-blocking, full-function wavelength selective optical cross-connect switches.
Innovation Solution
A reconfigurable all-optical wavelength selective optical cross-connect switch is developed, utilizing an optical coupling device with a wavelength dispersion element and an optical phased-matrix coupling device to spatially separate and independently route wavelength channels, allowing for arbitrary routing and blocking of channels without cross-talk, using a liquid crystal display device as a spatial light modulator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electronic techniques are used to add or drop wavelength channels, then network functionality is provided, but network speed is insufficient for future demands
Solution Approach 1:
The patent replaces electronic techniques with all-optical processing. The optical cross-connect switch uses optical components (optical switches, wavelength selective switches) to add, drop, and route wavelength channels directly in the optical domain without electronic conversion, thereby achieving higher network speed while maintaining functionality.
Solution Approach 2:
The patent segments the optical signal into individual wavelength channels using wavelength selective switching. Each wavelength channel can be independently routed, added, or dropped at optical cross-connect nodes, allowing granular control without demultiplexing the entire signal, thus reducing complexity.
2Adaptability or versatility
If complex design architectures are used to selectively route individual wavelength channels, then wavelength selectivity is achieved, but device complexity increases dramatically
Solution Approach 1:
The patent employs a universal optical cross-connect architecture that can perform multiple functions (routing, adding, dropping, blocking) for any wavelength channel through a single integrated device. The non-blocking switch fabric provides universal connectivity without requiring separate demultiplexing and remultiplexing architectures for each wavelength.
Solution Approach 2:
The patent extracts the wavelength selection function from complex demultiplexing architectures and implements it directly at the optical cross-connect node using wavelength selective switches. This allows individual wavelength channels to be selected and routed without extracting them from the multiplexed signal through complex demultiplexing processes.
3Device complexity
If all channels are routed to one output port, then simple switching is achieved, but the ability to block inputs completely or route to multiple outputs is lost
Solution Approach 1:
The patent implements a dynamic non-blocking switch fabric that can adapt its routing configuration in real-time. Each input port can be dynamically connected to any output port or blocked completely, and each wavelength channel can be independently routed to multiple outputs simultaneously, providing full adaptability while maintaining a relatively simple optical switching architecture.
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 enables efficient, non-blocking routing of wavelength channels, reducing complexity and increasing network flexibility by allowing any wavelength channel to be routed to any output port, thereby enhancing the capacity and adaptability of optical communications networks.
Implementation Method 1
a wavelength dispersion element for spatially separating the plurality of wavelength channels in the optical input signal beam to form a plurality of spatially separated wavelength channel beams
Implementation Method 2
an optical phased-matrix coupling device for independently modifying the phase of each of the spatially separated wavelength channel beams such that, for at least one wavelength channel beam, a selected fraction of the light is coupled to the first output port and a fraction of the light is coupled away from the first output port
Data Source
AI summary
An optical coupling device including: at least a first input port for delivering an optical input signal beam that includes a plurality of wavelength channels; at least a first optical output port for receiving an optical output signal beam; a wavelength dispersion element for spatially separating the plurality of wavelength channels in the optical input signal beam to form a plurality of spatially separated wavelength channel beams; an optical coupling device for independently modifying the phase of each of the spatially separated wavelength channel beams such that, for at least one wavelength channel beam, a selected fraction of the light is coupled to the first output port and a fraction of the light is coupled away from the first output port.