Photonic Switch Controller Stabilizes Optical Signal Levels

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Solution Overview

Problem

Large photonic switches experience fluctuating optical signal levels due to reconfiguration, leading to performance deficiencies and link budget issues, as optical amplifiers and switching states are currently functionally separate, resulting in inadequate signal compensation.

Innovation Solution

A controller is integrated with both the switching fabric and optical amplifiers to monitor and adjust the switching state and amplifier gains, generating control signals to stabilize optical signal levels by compensating for path losses, ensuring they remain below a predetermined threshold.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the switching fabric is reconfigured to meet connectivity requirements, then the adaptability is improved, but the optical signal levels fluctuate causing performance deficiencies

Engineering Contradiction:

Improveconnectivity configurationVSAvoidoptical signal level stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The controller monitors the optical signal levels at the output ports and uses this feedback to dynamically adjust the amplifier gains. When the switching fabric is reconfigured, the controller detects changes in optical path losses and automatically adjusts amplifier gains to compensate, thereby maintaining stable optical signal levels despite connectivity changes.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system changes the gain parameter of the optical amplifiers dynamically based on the switching fabric configuration. The controller calculates the required gain adjustments by comparing the current optical path losses with the target signal levels, and adjusts amplifier parameters accordingly to maintain signal stability during reconfiguration.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If optical amplifiers are used to compensate for signal loss, then the signal level is improved, but the device complexity increases due to functional separation of amplifiers and switching

Engineering Contradiction:

Improveoptical signal levelVSAvoidcontrol architecture

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The controller merges the control functions of the switching fabric and the optical amplifiers into a single integrated control unit. This unified controller manages both the switching configuration and amplifier gain settings, eliminating the need for separate control systems and reducing overall device complexity despite the presence of multiple amplifiers.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The controller performs multiple functions: it generates switching fabric control signals for routing optical signals and simultaneously generates amplifier control signals for gain adjustment. This multi-functional approach consolidates control responsibilities and simplifies the system architecture by having one controller handle both switching and amplification control tasks.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If larger switches with more intermediate stages are used to increase port count, then the adaptability is improved, but the optical signal loss increases

Engineering Contradiction:

Improveport countVSAvoidoptical signal loss

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The optical amplifiers are positioned to provide compensation before signals experience excessive loss from multiple intermediate stages. The controller proactively adjusts amplifier gains based on the known switching fabric configuration and expected path losses, ensuring signal levels are maintained before they degrade below acceptable thresholds.

Inventive Principle:

Principle #10Preliminary action

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 integration stabilizes optical signal levels, maintains link budget requirements, and minimizes bit error rates by dynamically adjusting amplifier gains and switching configurations, enhancing the reliability and performance of photonic switches.

Implementation Method 1

one or more optical amplifiers for amplifying one or more of said optical signals

Methodology Applied

Scientific EffectOptical amplification:

Data Source

PatentEP3881451B1Method and apparatus for interdependent control of amplification and switching state in photonic switch

Publication Date: 2025.03.26 HUAWEI TECH CO LTD

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AI summary

A method and apparatus for controlling an optical switch. The switch includes a switching fabric (130) and optical amplifiers (150) for amplifying optical signals. A configuration for the switching fabric (130) is generated and implemented. The configuration indicates a set of optical paths between switching fabric input ports (132) and the output ports (134). Optical path losses through the switching fabric (130) vary based on the configuration. An amplifier control signal for controlling gains of the optical amplifiers (150), is also provided. The configuration for the switching fabric (130) is generated based on the gains of the optical amplifiers (150), the amplifier control signal is generated based on the configuration for the switching fabric (130), or both.