All-Optical Packet Switching via Injection-Locking Laser Diodes
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Solution Overview
Problem
Current optical networks based on circuit-switching technology are inadequate for handling heavy data traffic due to the lack of practical optical buffers and limited optical logic gates, which hampers all-optical processing and routing of packet-formatted signals.
Innovation Solution
The implementation of an all-optical switching process using a laser device that injects both incoming data and control signals, allowing for optical header processing, decision-making, and switching of data packets based on address bits, enabling selective transmission or suppression of packets without converting signals to electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If hybrid optical packet switches are used where header is converted to electrical signals for processing, then header processing capability is improved, but device complexity and conversion overhead increase
Solution Approach 1:
The patent replaces the electrical signal processing system with an all-optical system. Instead of converting optical headers to electrical signals for processing, the invention uses optical logic gates and optical buffers to process headers directly in the optical domain, eliminating the need for optical-to-electrical conversion and associated complexity
Solution Approach 2:
The patent introduces optical buffers as intermediary storage elements that hold packets temporarily during optical header processing. These optical buffers enable the system to store and retrieve packets without electrical conversion, facilitating pure optical processing while maintaining the necessary control flow
2Stability of the object's composition
If circuit-switching technology is used in optical networks, then network stability is improved, but adaptability to packet-switched data traffic deteriorates
Solution Approach 1:
The patent implements dynamic packet routing capabilities in the optical domain. The optical packet switch can dynamically determine routing paths based on header information and buffer availability, allowing the network to adapt to varying data traffic patterns while maintaining stable operation through controlled buffer management and routing decisions
3Device complexity
If optical buffers are not implemented, then device complexity is reduced, but packet routing capability deteriorates
Solution Approach 1:
The patent introduces optical buffers as intermediary storage elements that hold packets temporarily during optical header processing. These optical buffers enable the system to store and retrieve packets without electrical conversion, facilitating pure optical processing while maintaining the necessary control flow
Solution Approach 2:
The patent implements preliminary header processing and routing decision-making before packet transmission. The optical buffer allows the system to process headers, determine routing paths, and prepare control signals in advance, enabling efficient packet switching without requiring complex real-time buffer management during transmission
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 enables efficient all-optical packet switching and routing, enhancing the capability to handle high data traffic by eliminating the need for electrical signal conversion and utilizing the bistable nature of injection-locking in laser diodes for effective packet processing and routing.
Implementation Method 1
the first laser device includes at least locked and unlocked states at both λc and λd respectively, and wherein the first laser device selects between the locked and unlocked states at the wavelength of λc, dependent upon a correlation between the trigger and the address bit
Data Source
AI summary
A process for all-optically switching an incoming optical signal having at least a data packet is provided. The data packet including at least an address bit in its header, and the process includes receiving the data packet; processing the header optically; storing the decision made during the processing of the header; and switching the whole incoming data packet dependent upon the decision.