Optical Transceiver Self-Measurement of Filtering Characteristics

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Solution Overview

Problem

Current methods for measuring filtering characteristics in optical communication systems are costly and difficult to scale, as they require external instruments to determine the filtering characteristics of both the transmitting and receiving ends.

Innovation Solution

A method and apparatus that use nonoverlapped spectral parts of measurement signals passing through different filtering modules to determine the filtering characteristics of the receiving and transmitting ends, and their joint response, without the need for additional instruments, by utilizing the transmitter and receiver themselves.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If external instruments are used to measure filtering characteristics, then measurement accuracy is improved, but cost and ease of deployment deteriorate

Engineering Contradiction:

Improvefiltering characteristic measurement accuracyVSAvoiddeployment cost and scalability

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The communication equipment uses its own transmitter and receiver to measure filtering characteristics internally. The transmitter transmits test signals and the receiver receives them, allowing the system to self-diagnose and self-measure without external instruments. This eliminates the need for expensive external measurement equipment while maintaining measurement capability.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The transmitter and receiver are designed to serve dual purposes: normal communication function and measurement function. The same hardware components used for data transmission are also used for transmitting test signals and measuring filtering characteristics, eliminating the need for separate dedicated measurement equipment.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If traditional measurement methods are used, then comprehensive filtering characteristic data is obtained, but device complexity and cost increase

Engineering Contradiction:

Improvefiltering characteristic measurement capabilityVSAvoidmeasurement system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The existing transmitter and receiver components perform both communication and measurement functions. The transmitter sends both data signals and test signals, while the receiver processes both types of signals, eliminating the need for separate measurement equipment and reducing overall system complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system measures its own filtering characteristics using its own components. The transmitter and receiver work together to characterize the transmission channel and filtering effects without requiring external measurement instruments, thereby simplifying the measurement system architecture.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS10116388B2Apparatus for measuring a filtering characteristic, pre-equalizer and communication equipment

Publication Date: 2018.10.30 FUJITSU LTD

AI summary

A method and apparatus for measuring a filtering characteristic, pre-equalizer and communication equipment. The method includes: obtaining a receiving signal after two measurement signals of different spectral ranges pass through different filtering modules and are received at the same time at a receiving end; and determining a part of a filtering characteristic of a receiving end and a part of a joint response according to a nonoverlapped spectral part of the two signals in the spectrum of the receiving signal.