Optical Transceiver Circuit for Polarization-Safe Wavelength Separation

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Solution Overview

Problem

Existing optical integrated circuits face challenges in maintaining uniform performance across varying polarizations due to the random changes in light polarization caused by single-mode optical fibers, leading to improper wavelength separation and interference between signal frames.

Innovation Solution

Incorporating a polarizing splitter rotator to separate TE and TM mode polarizations, followed by demultiplexers to process each polarization separately, and using delayers and variable optical attenuators to compensate for manufacturing errors and optical loss, ensuring uniform performance across different polarizations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If electromagnetic waves with multiple polarizations are directly input to wavelength separation elements, then the device structure can be simplified, but wavelength separation performance deteriorates due to random polarization changes

Engineering Contradiction:

Improvedevice structureVSAvoidwavelength separation performance

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The optical circuit is segmented into distinct functional modules: polarization separation element, delay elements, variable optical attenuators, and wavelength separation element. This segmentation allows each component to perform its specific function optimally, with the polarization separation element handling polarization diversity and the wavelength separation element focusing on wavelength multiplexing/demultiplexing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The polarization separation element performs preliminary action by separating electromagnetic waves into different polarization components before they reach the wavelength separation element. Delay elements also perform preliminary action by adjusting path lengths to synchronize signal frames, preventing interference before wavelength separation occurs.

Inventive Principle:

Principle #10Preliminary action

2Manufacturing precision

If polarization separation elements are added to handle multiple polarizations, then wavelength separation performance is improved, but device complexity increases

Engineering Contradiction:

Improvewavelength separation performanceVSAvoiddevice structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The polarization separation element serves multiple functions: it separates different polarization components, enables the system to handle polarization diversity from single-mode optical fibers, and allows subsequent wavelength separation elements to operate on uniformly polarized light. This multi-functionality justifies the added complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The polarization separation element acts as an intermediary between the input electromagnetic waves and the wavelength separation element. It transforms the input with random polarization into separated polarization components, which then pass through delay and attenuation stages before reaching the wavelength separation element, ensuring optimal performance.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If delay elements and variable optical attenuators are added to compensate for manufacturing errors, then signal frame interference is reduced, but device complexity increases

Engineering Contradiction:

Improvesignal frame interferenceVSAvoiddevice structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Variable optical attenuators provide feedback control by adjusting the intensity of each polarization component based on detected signal levels. This feedback mechanism compensates for manufacturing variations and ensures optimal signal balance, reducing interference between signal frames and improving overall system reliability.

Inventive Principle:

Principle #23Feedback

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 effective wavelength separation and reduced interference, enabling high-density data transmission with uniform characteristics for any polarization, thus enhancing the performance of optical integrated circuits in data centers.

Implementation Method 1

a first element having a function of separating each polarization from electromagnetic waves including multiple polarizations

Methodology Applied

Scientific EffectPolarization separation: Polarisation

Implementation Method 2

a second element having a function of separating components of multiple wavelengths included in the electromagnetic waves into components of each wavelength

Methodology Applied

Scientific EffectWavelength separation: Diffraction

Data Source

PatentUS20260086290A1Optical integrated circuit and optical transceiver

Publication Date: 2026.03.26 KYOCERA CORP

AI summary

An optical integrated circuit includes a first element having a function of separating each polarization from electromagnetic waves including multiple polarizations, or a function of rotating at least some of the polarizations after separating each polarization from electromagnetic waves including multiple polarizations, and a second element having a function of separating components of multiple wavelengths included in the electromagnetic waves into components of each wavelength. The first element and the second element are connected to each other in a cascade-like manner.