Optical Transceiver Filtering Characteristic Measurement

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Solution Overview

Problem

Current methods for measuring filtering characteristics in optical communication systems are costly and not suitable for large-scale use, as they require external instruments.

Innovation Solution

The method determines filtering characteristics of both the transmitting and receiving ends by analyzing the amplitude of receiving signals at different frequency offsets using the transmitting and local lasers, eliminating the need for additional measurement instruments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If external instruments are used to measure filtering characteristics, then measurement precision is improved, but device complexity and cost increase

Engineering Contradiction:

Improvefiltering characteristic measurement precisionVSAvoidmeasurement system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The communication equipment performs self-measurement of filtering characteristics by using its own transmitting laser, local laser, and signal processing capabilities. The equipment generates test signals, measures the amplitude response at different frequency offsets, and calculates filtering characteristics internally without requiring external measurement instruments, thereby simplifying the overall system while maintaining measurement accuracy

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The transmitting laser and local laser serve dual purposes: they function as operational components for normal communication and simultaneously as measurement tools for characterizing filtering properties. The signal processing unit also performs both communication signal processing and measurement data analysis, eliminating the need for dedicated external measurement equipment

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If external instruments are used to measure filtering characteristics, then measurement accuracy is improved, but ease of operation deteriorates

Engineering Contradiction:

Improvefiltering characteristic measurement precisionVSAvoidmeasurement operation ease

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The measurement process is fully automated within the communication equipment itself. The system automatically generates test signals, sweeps through different frequency offsets, measures amplitude responses, and calculates filtering characteristics without requiring external instruments or complex manual setup, making the operation simple and straightforward

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The measurement functions are merged with the normal communication signal processing functions. The same signal generation, transmission, reception, and processing chains are used for both communication and measurement purposes, eliminating the need for separate measurement操作流程 and reducing operational complexity

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10225010B2Method and apparatus for measuring a filtering characteristic, pre-equalizer and communication equipment

Publication Date: 2019.03.05 FUJITSU LTD

AI summary

A method and apparatus for measuring a filtering characteristic, pre-equalizer and communication equipment. The apparatus for measuring a filtering characteristic includes: a first processing unit configured to determine a filtering characteristic of a receiving end according to an amplitude of a receiving signal obtained after a measurement signal passes through a transmitting end filtering module and a receiving end filtering module at provided different frequency offsets of a transmitting laser of a transmitting end and a local laser of the receiving end.