Optical Module for Terabit Switch Using PIC and PLC Integration
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Solution Overview
Problem
Current fiber optic switch modules are limited by the architecture of central switch ICs connected to optical transceivers, leading to constraints such as high power consumption, restricted panel density, and increased costs due to the need for equalization and regeneration of electrical signals, which becomes a bottleneck as data speeds and lane numbers increase.
Innovation Solution
The integration of photonic integrated circuits (PICs) with light sources, optical splitters, and modulators, along with planar lightwave circuits (PLCs), reduces the need for equalization circuits and minimizes power consumption by converting electrical signals to optical signals closer to the switch IC, thereby reducing heating and increasing interconnect density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If optical transceivers are used in the front panel connected to central switch ICs, then data transfer capability is achieved, but power consumption increases due to equalization and regeneration requirements
Solution Approach 1:
The patent extracts the optical transceiver functionality from the front panel and relocates it to the switch IC itself. By integrating light sources, modulators, and photodetectors directly into the switch IC, the need for separate optical transceivers and their associated equalization circuits is eliminated, thereby reducing power consumption while maintaining data transfer capability
Solution Approach 2:
The patent merges the optical transmission functions (light generation, modulation, detection) directly into the switch IC architecture. This consolidation eliminates the electrical interconnects between separate transceivers and the switch IC, removing the need for equalization and regeneration circuits, thus reducing power consumption while preserving full data transfer functionality
2Productivity
If the number of lanes and modulation speeds increase to improve data throughput, then productivity increases, but device complexity and power consumption increase due to equalization requirements
Solution Approach 1:
The patent removes the equalization circuits from the system by extracting optical transmission functionality into the switch IC. By using optical interconnects within the IC, electrical signal degradation is eliminated, and the complex equalization circuits required for high-speed electrical links are no longer needed, thus reducing device complexity while maintaining high data throughput
Solution Approach 2:
The patent substitutes electrical signal transmission with optical signal transmission within the switch IC. This replacement eliminates the fundamental problem of electrical signal degradation over distance, removing the need for equalization circuits and reducing device complexity while enabling higher modulation speeds and greater data throughput
3Area of stationary object
If optical transceivers are placed on the front panel, then connectivity is provided, but panel density is restricted due to the size of transceivers
Solution Approach 1:
The patent merges the optical transceiver functions directly into the switch IC, eliminating the need for separate front panel transceiver components. This integration dramatically reduces the space required for optical connectivity components on the front panel, thereby increasing panel density while maintaining full connectivity functionality
Solution Approach 2:
The patent extracts optical transceiver functionality from the front panel assembly and relocates it to the switch IC. This removal of bulky transceiver components from the front panel directly increases the available area for other components or reduces the overall panel size, while connectivity capabilities are preserved through the integrated optical functions
4Reliability
If electrical links are used to connect transceivers to switch IC, then signal transmission is achieved, but signal degradation occurs rapidly over short distances requiring CDR circuits
Solution Approach 1:
The patent substitutes electrical signal transmission with optical signal transmission within the switch IC interconnects. Optical signals do not suffer from the same degradation issues as electrical signals over short distances, eliminating the need for clock and data recovery circuits while maintaining reliable signal transmission quality
Solution Approach 2:
The patent removes the need for CDR circuits by extracting the problematic electrical interconnect layer. By using direct optical interconnects within the IC, the signal degradation issues that necessitate CDR circuits are eliminated, thus reducing device complexity while maintaining signal transmission reliability
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 enhances the performance and efficiency of switch modules by reducing power consumption, increasing interconnect density, and minimizing heating, while maintaining high data transfer rates without the need for extensive equalization and regeneration, thus overcoming the limitations of traditional switch module architectures.
Implementation Method 1
a plurality of light sources for providing light
Implementation Method 2
an optical splitter having a plurality of inputs and outputs and for use in splitting the light provided by each of the plurality of light sources
Implementation Method 3
a plurality of modulators for modulating light received from the plurality of outputs of the optical splitter and for providing modulated optical signals
Implementation Method 4
detected by photodetectors that may be mounted on the PLC above turning mirrors
Data Source
AI summary
A switch module includes a switch integrated circuit (IC), a photonic integrated circuit (PIC), and a planar lightwave circuit (PLC). The PIC may include a plurality of light sources, an optical splitter, and a plurality of modulators. A dual MEMS may be used to align lens arrays, which may be used to couple light from the PIC to the PLC.