Optical Switch With All-Optical Memory Buffer and Packet Reshaping
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Solution Overview
Problem
Existing optical switch systems suffer from significant losses, dispersion, and noise in their buffer mechanisms, leading to packet loss and increased power consumption, particularly in high-performance computing environments.
Innovation Solution
An all-optical buffer system using an unbalanced Mach Zehnder Interferometer (MZI) combined with a fiber delay line (FDL) and semiconductor optical amplifiers (SOAs) for packet circulation and reshaping, along with optical dispersion management, to prevent packet loss and reduce latency while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fiber delay lines (FDL) are used for optical packet buffering, then packet loss is prevented, but signal loss and dispersion increase significantly
Solution Approach 1:
The patent replaces traditional fiber delay lines with a resonant cavity system that uses optical resonance to achieve packet buffering. This substitution eliminates the signal loss and dispersion problems inherent in FDLs by confining light within the resonant cavity through constructive interference, allowing multiple circulations without significant degradation.
Solution Approach 2:
The invention utilizes optical resonance phase transitions to control packet circulation. By adjusting the resonant conditions of the cavity, packets can be held, released, or circulated multiple times. The phase relationship between input and output signals is controlled to achieve desired buffering effects without the losses associated with traditional FDL approaches.
2Duration of action of moving object
If multiple fiber delay lines are used to extend buffering capacity, then longer packet holding times are achieved, but device complexity and component failure risk increase
Solution Approach 1:
The resonant cavity system serves multiple functions simultaneously: it provides buffering, wavelength conversion, and packet circulation capabilities in a single integrated structure. This multi-functionality eliminates the need for multiple separate FDLs and associated control mechanisms, reducing overall device complexity while extending packet holding time through multiple circulations.
Solution Approach 2:
The patent implements a nested structure where multiple packets can be buffered within the same resonant cavity by utilizing different resonance modes or sequential circulation. This nesting approach allows extended buffering capacity without proportionally increasing device complexity, as the same physical cavity handles multiple buffering tasks.
3Reliability
If electro-optical buffers are used for packet buffering, then buffering capability is improved, but power consumption increases
Solution Approach 1:
The invention replaces electro-optical conversion mechanisms with a purely optical resonant cavity system. By maintaining packets in the optical domain throughout buffering using resonance confinement, the system eliminates the high power consumption associated with electro-optical converters while preserving full buffering capability.
Solution Approach 2:
The resonant cavity system is self-sustaining for packet buffering, requiring minimal external energy input. Once packets are coupled into the resonant cavity, they are maintained through the natural resonance properties of the cavity structure without requiring continuous power input for active buffering, unlike electro-optical systems that require sustained electrical power for conversion and storage.
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 system enhances packet throughput, reduces latency, and improves routing flexibility by enabling extended buffering without electro-optical buffers, while reducing computational complexity and power consumption.
Implementation Method 1
an optical unbalanced Mach Zehnder Interferometer (MZI) acting as an optical logical AND gate
Implementation Method 2
a fiber delay line (FDL) having an FDL length, wherein the optical packet has an optical packet signal
Implementation Method 3
semiconductor optical amplifiers (SOAs) for packet circulation and reshaping
Data Source
AI summary
Consistent with some disclosed embodiments, an optical switch includes: a scheduler; and a buffer for buffering an optical packet including, arranged in a circuit, a clock generator for generating a clock signal, an optical unbalanced Mach Zehnder Interferometer (MZI) and a fiber delay line (FDL) having an FDL length, wherein the optical packet has an optical packet signal, wherein the scheduler is configured to insert the optical packet into the buffer and to determine a number of circulations of the optical packet through the circuit, wherein the MZI modulates the clock signal based on the optical packet signal to create a reshaped optical packet after each circulation of the optical packet through the circuit, and wherein the FDL introduces a delay in the optical packet proportional to the FDL length.