Reconfigurable Optical Switch for Multi-Directional Protection
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Solution Overview
Problem
Conventional optical protection switching schemes in telecommunication networks lack flexibility, particularly in multi-directional multiplexing capabilities, as they can only switch entire groups of channels from one direction or the other, limiting the customization and protection of optical channels.
Innovation Solution
A reconfigurable optical switch that can switch between optical protection and broadcast modes, utilizing multiple reconfigurable optical add/drop multiplexers (ROADMs) and switches with variable optical attenuators, electro-optical, acousto-optical, or opto-mechanical switches, allowing for flexible configuration between passing and blocking optical signals, enabling multi-directional multiplexing and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional optical protection switch is used to select between primary and secondary paths, then optical signal protection is achieved, but the switch can only select one path at a time and lacks multi-directional multiplexing capability
Solution Approach 1:
The optical switch is designed to perform multiple functions: it can operate as a protection switch selecting between primary and secondary paths, or as a multi-directional multiplexer receiving signals from multiple directions simultaneously. This universal design allows a single device to replace what would traditionally require separate dedicated devices for each function.
Solution Approach 2:
The switch configuration is made dynamic and reconfigurable, allowing it to adapt its behavior based on operational needs. The switch can dynamically change between protection mode (selecting one path) and multiplexing mode (receiving from multiple directions), providing flexibility without requiring multiple fixed-configuration devices.
2Reliability
If optical protection switch inserts between primary and secondary multiplexers to protect entire group of channels, then group-level protection is achieved, but flexibility for multi-direction multiplexing is lost
Solution Approach 1:
The system segments the optical signal handling at the channel level rather than forcing group-level protection. Individual optical channels can be selectively protected or multiplexed independently, allowing fine-grained control where specific channels receive protection while others participate in multi-directional multiplexing, resolving the conflict between group protection and multiplexing flexibility.
Solution Approach 2:
Different quality of service is applied to different channels: some channels receive full protection with dedicated primary and secondary paths, while other channels are configured for multi-directional multiplexing. This local differentiation allows the network to optimize each channel's configuration according to its specific requirements rather than applying a uniform approach to all channels.
3Adaptability or versatility
If reconfigurable optical add/drop multiplexers are used with multiple switches and variable optical attenuators, then flexible configuration and multi-directional multiplexing are enabled, but device complexity increases
Solution Approach 1:
Multiple functional components (ROADMs, switches, variable optical attenuators) are merged into an integrated reconfigurable optical switching system. Rather than operating as separate discrete devices, these components are combined and coordinated to work together as a unified system, achieving complex functionality while reducing overall system complexity through integration.
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
This solution provides greater flexibility in optical networks for channel protection and multiplexing, allowing for customization of transmission and protection of groups of channels, enhancing spectral efficiency and enabling simultaneous reception of channels from multiple directions.
Implementation Method 1
a variable optical attenuator
Implementation Method 2
electro-optical switches
Implementation Method 3
acousto-optical switches
Implementation Method 4
opto-mechanical switches
Data Source
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AI summary
An apparatus includes a first reconfigurable optical add/drop multiplexer (ROADM) to receive a first optical signal and a second ROADM to receive a second optical signal. The apparatus also includes a reconfigurable optical switch that includes a first switch, switchable between a first state and a second state, to transmit the first optical signal at the first state and block the first optical signal at the second state. The reconfigurable optical switch also includes a second switch, switchable between the first state and the second state, to transmit the second optical signal at the first state and block the second optical signal at the second state. The reconfigurable optical switch also includes an output port to transmit an output signal that is a sum of possible optical signals transmitted through the first switch and the second switch.