Multi-Beam Optical Frequency Monitoring With Single Interferometer Locking

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Solution Overview

Problem

Current systems require multiple locker optics elements to tune and lock multiple light beams, increasing complexity and cost as the number of channels increases, and are limited to single-channel frequency monitoring.

Innovation Solution

A multiple optical frequency monitoring assembly using a single locker optics element, such as an interferometer, combines and separates multiple light beams with different properties to enable simultaneous monitoring and locking of multiple light sources without additional control mechanisms, employing a static optical demultiplexer and parallel detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple locker optics elements are used to tune and lock multiple light beams, then each light beam can be independently monitored and locked, but system complexity and cost increase as the number of channels increases

Engineering Contradiction:
Improvefrequency locking accuracyVSAvoidsystem complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines multiple single-channel lockers into a single multi-channel locker optics element. The interferometer is configured with multiple input ports for receiving multiple light beams at different optical frequencies and multiple output ports for providing frequency monitoring signals. This merging approach allows simultaneous monitoring and locking of multiple light beams using one integrated device, thereby reducing system complexity and cost while maintaining frequency locking accuracy for each channel

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The interferometer serves multiple functions simultaneously: it acts as a frequency reference for multiple light beams, provides frequency discrimination for each channel, and generates monitoring signals for multiple wavelengths. This multi-functional design eliminates the need for separate locker optics elements for each light beam, resolving the contradiction between reliable frequency locking and system complexity

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Reliability

If multiple locker optics elements are used to monitor multiple light beams, then each channel can be independently monitored, but the cost increases with the number of channels

Engineering Contradiction:
Improvefrequency monitoring accuracyVSAvoidsystem cost
Core Design Contradiction:
ReliabilityVSEase of manufacture

Solution Approach 1:

The patent merges multiple single-channel monitoring systems into a single multi-channel interferometer. The device includes multiple input ports for different light beams and multiple output ports for frequency monitoring signals, allowing simultaneous monitoring of multiple channels using one instrument. This consolidation reduces the total number of components needed, thereby lowering system cost while maintaining accurate frequency monitoring for each channel

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The interferometer is designed as a universal frequency monitoring device that can simultaneously handle multiple light beams at different optical frequencies. It provides frequency discrimination and monitoring signal generation for multiple channels through its multiple input and output ports, eliminating the need for multiple separate monitoring systems and reducing overall system cost

Inventive Principle:
Principle #6Universality (Multi-functionality)

3Device complexity

If a single locker optics element is used to monitor multiple light beams, then system complexity is reduced, but the ability to simultaneously monitor multiple frequencies is limited

Engineering Contradiction:
Improvesystem complexityVSAvoidmulti-frequency monitoring capability
Core Design Contradiction:
Device complexityVSAdaptability or versatility

Solution Approach 1:

The interferometer is designed with multi-functional capability to simultaneously monitor multiple optical frequencies. It includes multiple input ports for receiving different light beams and multiple output ports for providing frequency monitoring signals. The interferometer's resonant frequency response allows it to discriminate between different optical frequencies and provide independent monitoring signals for each channel, achieving both simplicity and versatility

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent extends the interferometer's functionality from single-frequency to multi-frequency monitoring by adding multiple input and output ports. This dimensional expansion allows the single device to handle multiple frequencies simultaneously through parallel signal paths, resolving the contradiction between device simplicity and multi-frequency monitoring capability

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

4Reliability

If multiple locker optics elements are used for multiple channels, then each channel has dedicated monitoring, but the system requires additional control mechanisms

Engineering Contradiction:
Improvechannel independenceVSAvoidcontrol mechanisms
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines multiple independent monitoring functions into a single interferometer with multiple input and output ports. Each light beam enters through a dedicated input port and receives frequency monitoring through a corresponding output port. The interferometer's internal structure provides automatic frequency discrimination without requiring external control mechanisms, thereby maintaining channel independence while reducing control system complexity

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The interferometer performs automatic frequency discrimination and monitoring signal generation for multiple channels without requiring external control mechanisms. The device uses its inherent resonant frequency response to automatically distinguish between different optical frequencies and generate appropriate monitoring signals, eliminating the need for additional control systems while maintaining reliable channel-independent monitoring

Inventive Principle:
Principle #25Self-service

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 allows for the independent detection and continuous monitoring of multiple light sources, reducing system complexity and cost by using a single locker optics element for parallel frequency locking across multiple channels without the need for dithering or multiplexing.

Implementation Method 1

an interferometer configured to receive the monitored light beam having a first incident intensity corresponding to the first portion of the first light beam and a second incident intensity corresponding to the first portion of the second light beam

Methodology Applied
Scientific EffectInterference: Interference

Implementation Method 2

the interferometer is characterized by a resonant frequency response comprising a plurality of frequency ranges and a plurality of resonant peak frequencies at which a transmittivity of the interferometer is at a maximum transmission level

Methodology Applied
Scientific EffectResonance: Resonance

Implementation Method 3

filter optics configured to receive the monitored output light beam, and separate the first portion of the first light beam having the first transmitted intensity from the first portion of the second light beam having the second transmitted intensity

Methodology Applied
Scientific EffectFilter (optical): Filter (optical)

Data Source

PatentUS20250003796A1Multiple light beam optical frequency monitoring assembly
Publication Date: 2025.01.02 LUMENTUM TECHNOLOGY UK LTD
  • US20250003796A1 patent drawing
  • US20250003796A1 patent drawing
  • US20250003796A1 patent drawing

AI summary

A multiple optical frequency monitoring assembly includes a first light source configured to generate a first light beam; a second light source configured to generate a second light beam; combiner optics configured to combine the first light beam and the second light beam into a combined light beam; a beam splitter configured to split the combined light beam into a monitored light beam and a reference light beam; an interferometer configured to receive the monitored light beam and output the monitored light beam as a monitored output light beam according to a resonant frequency response; filter optics configured to separate the monitored output light beam into two output beams; a detector configured to measure the two output beams; and a controller configured to tune the first light source and the second light source based on the two measured output beams and the reference light beam.