Optical Module Polarization Management via Local Fiber Selection

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Solution Overview

Problem

Optical data communication systems face challenges in reliably transmitting and detecting laser light due to issues with polarization maintenance and efficiency, particularly at high temperatures, which affect the performance and cost of optical modules.

Innovation Solution

The optical module design includes a laser light supply system with polarization-maintaining optical fibers connecting the laser output to the chip, and non-polarization-maintaining fibers for data transmission and reception, along with a link-fiber interface, to manage polarization and reduce costs while maintaining efficient data communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If polarization-maintaining optical fibers are used to connect the laser output to the chip, then polarization stability is improved, but device complexity and cost increase

Engineering Contradiction:

Improvepolarization stabilityVSAvoidfiber type complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies different fiber types in different locations within the optical module. Polarization-maintaining fibers are used specifically for the laser light supply connection where polarization stability is critical, while non-polarization-maintaining fibers are used for data transmission where polarization control is not required. This local differentiation resolves the contradiction by applying complexity only where necessary.

Inventive Principle:

Principle #3Local quality

2Reliability

If polarization-maintaining optical fibers are used throughout the system, then polarization maintenance is improved, but manufacturing cost increases

Engineering Contradiction:

Improvepolarization maintenanceVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent reduces manufacturing costs by using polarization-maintaining fibers only where polarization maintenance is critical (laser light supply path), and standard non-polarization-maintaining fibers for data transmission paths where polarization control is not required. This selective application reduces overall system cost while maintaining necessary performance.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If non-polarization-maintaining fibers are used for data transmission, then cost is reduced, but polarization control capability is lost

Engineering Contradiction:

Improvecost reductionVSAvoidpolarization control

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent recognizes that polarization control is only necessary in specific parts of the system (laser light supply path), not in data transmission paths. By using non-polarization-maintaining fibers for data transmission, the system achieves cost reduction without sacrificing polarization control where it is actually needed.

Inventive Principle:

Principle #3Local quality

4Reliability

If separate polarization-maintaining fibers are used for laser supply and data transmission, then polarization stability is improved, but device complexity increases

Engineering Contradiction:

Improvepolarization stabilityVSAvoidfiber configuration complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent simplifies device complexity by using non-polarization-maintaining fibers for data transmission paths where polarization control is not required, while reserving polarization-maintaining fibers only for the laser light supply path. This differentiated approach reduces overall system complexity compared to using polarization-maintaining fibers throughout.

Inventive Principle:

Principle #3Local quality

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 configuration enhances the reliability and efficiency of optical data communication by maintaining polarization across the optical links, reducing light loss, and lowering system costs, while allowing for scalable and cost-effective manufacturing.

Implementation Method 1

a polarization-maintaining optical fiber optically connected between the laser output optical port and the laser input optical port of the chip

Methodology Applied

Scientific EffectPolarization maintenance: Polarisation

Implementation Method 2

a first non-polarization-maintaining optical fiber optically connected between the transmit data optical port of the chip and the transmit data connector of the link-fiber interface

Methodology Applied

Scientific EffectOptical transmission: Optical Fibre

Data Source

PatentUS10845555B2Optical module and associated methods

Publication Date: 2020.11.24 AYAR LABS INC

AI summary

An optical module includes a laser light supply system and a chip disposed within a housing. The chip includes a laser input optical port and a transmit data optical port and a receive data optical port. The optical module includes a link-fiber interface exposed at an exterior surface of the housing. The link-fiber interface includes a transmit data connector and a receive data connector. The optical module includes a polarization-maintaining optical fiber connected between a laser output optical port of the laser light supply system and the laser input optical port of the chip. The optical module includes a first non-polarization-maintaining optical fiber connected between the transmit data optical port of the chip and the transmit data connector of the link-fiber interface. The optical module includes a second non-polarization-maintaining optical fiber connected between the receive data optical port of the chip and the receive data connector of the link-fiber interface.