Optoelectronic Switch Fiber Count Reduction via DWDM Multiplexing
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Solution Overview
Problem
Conventional optoelectronic switches require a large number of fiber pairs for connections between leaf and spine switches, leading to unwieldy setups and increased complexity, especially in large-scale systems.
Innovation Solution
The implementation of a fabric port multiplexer in the leaf rack unit combines signals from multiple ports into a single connection, which is then demultiplexed at the spine rack unit, reducing the number of required connections and using dense wavelength-division multiplexing (DWDM) to efficiently manage optical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate fiber connections are used between each leaf switch port and spine switch port, then signal transmission reliability is ensured, but the fiber count becomes excessively large and the system becomes unwieldy
Solution Approach 1:
The patent combines multiple separate fiber connections into a single fiber connection by using wavelength division multiplexing (WDM) technology. Multiple optical signals carrying data from different leaf switch ports are merged onto one fiber pair by assigning each signal a unique wavelength, thereby reducing the fiber count while maintaining full connectivity between leaf and spine switches.
Solution Approach 2:
A single fiber connection is made to serve multiple functions by carrying multiple optical signals simultaneously through wavelength division multiplexing. This allows one fiber pair to replace what would traditionally require multiple separate fiber pairs, making the fiber connection universal for multiple port connections.
2Device complexity
If the number of fiber pairs is reduced through multiplexing, then device complexity is reduced, but signal management becomes more challenging
Solution Approach 1:
The system incorporates wavelength management mechanisms that track and monitor which wavelengths are assigned to which ports and connections. This feedback system ensures that signals are properly routed and managed despite being multiplexed onto shared fiber connections, making signal management systematic rather than chaotic.
3Device complexity
If multiple signals are multiplexed onto a single fiber, then fiber count is reduced, but optical cross-talk increases
Solution Approach 1:
The patent uses wavelength division multiplexing where each optical signal is assigned a distinct wavelength parameter. By separating signals in the wavelength domain rather than sharing the same wavelength, the system reduces optical cross-talk while still achieving fiber consolidation. The narrow spectral range management mentioned in the summary refers to carefully controlling the wavelength assignments to minimize interference.
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 approach significantly reduces the fiber count between rack units, simplifies the setup, and maintains performance by using DWDM to manage multiple signals within a narrow spectral range, thereby minimizing optical cross-talk and enhancing scalability.
Implementation Method 1
coarse wavelength-division multiplexing may be employed to multiplex the lanes of one port onto a single fibre pair, the signal from each lane being carried at a different optical carrier wavelength
Implementation Method 2
a demultiplexer arranged to separate an incoming multiplexed signal received from a first connection into a first signal and a second signal, the first signal directed towards the fabric port of the first spine switch and the second signal directed towards the fabric port of the second spine switch
Data Source
AI summary
An optoelectronic switch for transferring an optical signal from a source external client device to a destination external client device, includes a leaf rack unit having thereon a leaf switch assembly including: a leaf switch having a plurality of fabric ports including a first fabric port and a second fabric port; and a fabric port multiplexer associated with the leaf switch, arranged to combine a first signal from the first fabric port and a second signal from the second fabric port onto a first connection, in the form of an outgoing first multiplexed signal. The optoelectronic switch further includes a spine rack unit including: a plurality of spine switches including a first spine switch having a fabric port and a second spine switch having a fabric port; and a demultiplexer arranged to separate an incoming multiplexed signal received from a first connection into a first signal and a second signal, the first signal directed towards the fabric port of the first spine switch and the second signal directed towards the fabric port of the second spine switch.