Multi-Wavelength Laser Router with Sub-Nanosecond Switching
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Solution Overview
Problem
Current optical switching technologies in data center networks face limitations in bandwidth and complexity due to single-wavelength transmission and slow switching speeds, especially with cyclic wavelength routers requiring multi-electrode control and sophisticated algorithms.
Innovation Solution
A multi-wavelength multi-port laser and optical transmission router with an N×N intra-cavity wavelength router, port-selection semiconductor optical amplifiers, and wavelength-selection semiconductor optical amplifiers, allowing rapid switching of output ports and wavelengths by forming optical resonant cavities for minimal loss and simultaneous multi-wavelength transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a cyclic wavelength router is used for optical switching, then the switching speed can be improved, but the device complexity increases due to multi-electrode control requirements
Solution Approach 1:
The patent divides the optical switching function into two independent parts: wavelength selection (handled by the intra-cavity wavelength router) and port selection (handled by the semiconductor optical amplifiers). This segmentation eliminates the need for multi-electrode control in a single device, reducing complexity while maintaining fast switching speeds through independent control of each component.
Solution Approach 2:
The semiconductor optical amplifiers serve dual functions: they act as both wavelength filters (by selecting specific wavelengths from the multi-wavelength laser) and as output port selectors (by directing selected wavelengths to specific ports). This multi-functionality reduces the need for separate control mechanisms, simplifying the overall device architecture.
2Device complexity
If only one wavelength is transmitted between nodes, then the device complexity is reduced, but the bandwidth is limited
Solution Approach 1:
The patent combines multiple wavelength channels into a single optical path using the intra-cavity wavelength router. Multiple wavelengths are generated within the laser cavity and routed through the same optical path to the semiconductor optical amplifiers, which then direct them to appropriate ports. This merging approach increases bandwidth capacity while maintaining relatively simple device architecture.
Solution Approach 2:
The patent adds the wavelength dimension to the traditional single-channel optical link. By utilizing multiple wavelengths simultaneously in the same physical medium, the system achieves wavelength-division multiplexing, effectively increasing bandwidth capacity without adding more physical paths or significantly increasing device complexity.
3Speed
If a tunable laser with carrier plasma effect is used, then the switching speed is improved to less than 10 ns, but the manufacturing precision requirements increase
Solution Approach 1:
The patent uses semiconductor optical amplifiers instead of complex tunable laser structures requiring carrier plasma effect control. The SOAs are simpler, more robust components with faster response times and lower manufacturing precision requirements, achieving comparable or superior switching performance with greater manufacturing tolerance.
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
Enables rapid and efficient switching of multiple wavelengths with reduced complexity, achieving sub-nanosecond latency and increased bandwidth by utilizing semiconductor optical amplifiers for quick port and wavelength selection, with switching speeds less than 1 ns.
Implementation Method 1
The switching speed of the chip using the carrier plasma effect can be less than 10 ns
Implementation Method 2
An optical resonant cavity of a certain wavelength is formed between the reflective facet of any one of the port-selection semiconductor optical amplifiers and the partial reflector of any one of the wavelength-selection semiconductor optical amplifiers
Data Source
AI summary
A multi-wavelength multi-port laser and router. By arranging a reflective facet at one end of the port-selection semiconductor optical amplifier and a partial reflector at one end of the wavelength-selection semiconductor optical amplifier, and cooperating with the intra-cavity wavelength router to form N×N optical resonant cavities, so that each optical resonant cavity can only emit the wavelength corresponding to the lowest round-trip loss between input and output ports. The extra-cavity wavelength router is mirrored with respect to the intra-cavity wavelength router, so that one or more wavelengths of light excited by any port-selection semiconductor optical amplifier can be transmitted from the corresponding output port of the extra-cavity wavelength router. The switching of the wavelength and output ports of the router is performed by on-off switching of the port-selection semiconductor optical amplifier and wavelength-selection semiconductor optical amplifier, and the switching time can be less than 1 ns.