Cross-Connect Switch Array for Low-Power Optical Routing

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Solution Overview

Problem

Data centers face significant energy consumption challenges due to intrinsic router heating effects and expansion of data center platforms, limiting the effectiveness of HVAC techniques in reducing energy usage.

Innovation Solution

A cross-connect switch architecture incorporating a cross-point switch array with avalanche photo diodes and metal oxide semiconductor (MOS) transistors, coupled with transimpedance amplifiers, which provides low power consumption and low signal losses while enabling fast channel-to-channel switching and a compact form factor through impedance matching and degeneration resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If traditional router architectures are used, then signal routing functionality is provided, but DC power consumption is high due to intrinsic heating effects

Engineering Contradiction:

ImproveDC power consumptionVSAvoidsignal routing functionality

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent replaces traditional electronic router switching mechanisms with an optical cross-connect architecture using photo detectors, MOS transistor switches, and transimpedance amplifiers. This substitution of electronic signal routing with optical detection and electrical switching reduces intrinsic heating effects and lowers DC power consumption while maintaining signal routing functionality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent implements impedance matching between photo detector inductance and MOS transistor parasitic capacitance, and uses degeneration resistance to optimize the operating parameters of the circuit. These parameter optimizations enable the system to achieve low power consumption and high bandwidth performance simultaneously by tuning the electrical characteristics to minimize losses and maximize efficiency.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If data center platforms are expanded to handle growth, then internet capacity and IoT support increase, but energy consumption increases

Engineering Contradiction:

Improveinternet capacityVSAvoidenergy consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent divides the data center switching function into modular components: photo detectors for optical signal reception, cross-point switch arrays for routing, and transimpedance amplifiers for signal amplification. This segmentation allows each component to be optimized independently for low power consumption while collectively providing high internet capacity and IoT support.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The optical cross-connect switch architecture provides universal functionality for routing various types of data traffic including internet traffic and IoT data. The same hardware platform can handle different protocols and data types, enabling data center expansion to support growing internet capacity and IoT deployments without proportionally increasing energy consumption.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If switch speed is increased for fast channel-to-channel switching, then productivity improves, but device complexity increases

Engineering Contradiction:

Improveswitching speedVSAvoidswitch architecture complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent replaces complex electronic switching mechanisms with a simplified optical-electrical hybrid architecture. Photo detectors convert optical signals to electrical signals, MOS transistors provide fast switching, and transimpedance amplifiers restore signal levels. This substitution achieves fast channel-to-channel switching while reducing overall system complexity compared to traditional high-speed electronic routers.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 solution achieves reduced DC power consumption, higher bandwidth per channel, and a smaller form factor, addressing both optical and electrical switching requirements with minimized buffering needs and interconnect parasitic losses.

Implementation Method 1

Each cross-point switch array includes a plurality of switches. Each switch is coupled between a respective photo detector and a respective amplifier

Methodology Applied

Scientific EffectPhotoelectric effect: Photoelectric Effect

Implementation Method 2

a photo diode inductance at least partially impedance matches a parasitic capacitance of a MOS transistor coupled to the photo diode

Methodology Applied

Scientific EffectImpedance matching:

Implementation Method 3

the amplifiers are transimpedance amplifiers

Methodology Applied

Scientific EffectTransimpedance amplification:

Data Source

PatentUS20250097611A1Cross-connect switch architecture

Publication Date: 2025.03.20 RENESSELAER POLYTECHNIC INST

AI summary

A cross-connect switch architecture is described. A cross-connect switch device includes a cross-point switch array, a plurality of photo detectors and a plurality of amplifiers. The cross-point switch array includes a plurality of switches. Each switch is coupled between a respective photo detector and a respective amplifier and is configured to couple the respective photo detector to the respective amplifier when the switch is selected.