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Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

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Baseband frequency response measurement system for optical components.

M Maeda, K Nagano, Y Minai

|March 4, 2010

Summary

This summary is machine-generated.

This study introduces a novel sweep-frequency measurement system using a buried heterostructure laser diode. This system accurately characterizes optical component frequency responses for advanced fiber optic transmission systems.

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Area of Science:

Optical Engineering
Telecommunications Systems

Background:

Designing optical fiber transmission systems requires understanding component baseband frequency responses.
The sweep-frequency method offers high Signal-to-Noise Ratio (SNR) for frequency response measurements.
Gallium Arsenide (GaAs) lasers present challenges like resonances and spectrum broadening below 1 GHz.

Purpose of the Study:

To overcome limitations of GaAs lasers in sweep-frequency measurements.
To develop an improved optical signal source for precise frequency response analysis.
To enhance the design of optical fiber transmission systems.

Main Methods:

Employed a single transverse mode Gallium Arsenide (GaAs) laser, specifically a buried heterostructure laser, as the optical signal source.
Utilized a sweep-frequency measurement system for characterizing optical components.
Optimized the system to achieve a wideband flat sweep-frequency range.

Main Results:

Successfully addressed issues associated with conventional GaAs lasers, including resonances and spectrum broadening.
Achieved a wideband flat sweep-frequency range from 0.5 to 1300 MHz.
Demonstrated a wide dynamic range exceeding 60 dB at optical levels, ensuring high measurement accuracy.

Conclusions:

The developed sweep-frequency measurement system with a buried heterostructure GaAs laser is effective for obtaining accurate baseband frequency responses.
This advancement facilitates the design of more robust and efficient optical fiber transmission systems.
The system's wide dynamic and frequency ranges offer significant improvements over previous methods.