Apparatus and method for monitoring analog characteristic of optical transmitter, and optical transmitter

The optical transmitter analog characteristic monitoring apparatus and method utilize low-speed optoelectronic devices for correlation processing to efficiently estimate and compensate for transmitter imperfections, reducing hardware costs and power consumption.

JP2025130704APending Publication Date: 2025-09-08FUJITSU LTD
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Patent Information

Application Number
JP2025024782
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-02-27
Filing Date
2025-02-19
Publication Date
2025-09-08

AI Technical Summary

Technical Problem

Existing methods for monitoring and compensating for analog characteristic imperfections in optical transmitters are inefficient and costly, requiring additional communication resources and high hardware costs, especially when using broadband receivers and high-speed analog-to-digital converters.

Method used

An optical transmitter analog characteristic monitoring apparatus and method using low-speed optoelectronic devices for correlation processing between an optical signal to be measured and a modulated local signal to estimate transmitter characteristics, reducing the need for complex digital signal processing and high-speed hardware.

Benefits of technology

Significantly reduces hardware cost and power consumption while accurately monitoring and compensating for transmitter imperfections, eliminating the need for complex digital signal processing.

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Abstract

To provide an apparatus, method and optical transmitter for monitoring an analog characteristic of an optical transmitter in which: analog characteristic information of the optical transmitter is extracted by using the correlation quantity between the to-be-measured optical signal and the modulated local signal; the required hardware cost is much lower than that of a conventional broadband receiver; and, because there is no need to perform complex digital signal processing (DSP), power consumption is reduced greatly.SOLUTION: The method comprises: inputting a first signal to a first electro-optical converter to obtain a to-be-measured optical signal; inputting a second signal to a second electro-optical converter to obtain a modulated local signal, so that the second signal is determined according to the first signal and a to-be-monitored analog characteristic of the first electro-optical converter; performing correlation processing on the to-be-measured optical signal and the modulated local signal to obtain at least one correlation quantity; and estimating an analog characteristic of the first electro-optical converter according to the correlation quantity.SELECTED DRAWING: Figure 1
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