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Related Experiment Video

Updated: May 25, 2026

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Dynamic linewidth measurement technique using digital intradyne coherent receivers.

Robert Maher¹, Benn Thomsen

¹Optical Networks Group, Department of Electronic and Electrical Engineering, University College London, London WC1E7JE, UK. r.maher@ee.ucl.ac.uk

|January 26, 2012

Summary

A new method measures tunable laser phase noise and stabilization time. A tunable laser achieves minimum linewidth within 50 ns during wavelength switching in a WDM system.

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Area of Science:

Optical Engineering
Laser Physics
Telecommunications

Background:

Characterizing laser phase noise and stabilization is crucial for high-speed optical communication systems.
Tunable lasers, particularly Distributed Strain-Defi ned Bragg Reflector (DSDBR) lasers, are key components in Wavelength Division Multiplexing (WDM) systems.
Fast wavelength switching requires precise understanding of laser dynamics to maintain signal integrity.

Purpose of the Study:

To develop and validate a dynamic linewidth measurement technique for characterizing tunable lasers.
To investigate the phase noise characteristics and laser stabilization time of tunable lasers under static and fast switching conditions.
To determine the minimum achievable linewidth for a DSDBR laser after a wavelength switching event.

Main Methods:

Employed a digital intradyne coherent receiver with a time domain frequency estimator for dynamic linewidth measurement.
Validated the measurement technique using a phase noise emulator and a low linewidth external cavity laser.
Investigated the dynamic stabilization time (instantaneous frequency and linewidth) of a fast switching tunable DSDBR laser.

Main Results:

Successfully characterized phase noise and stabilization time using the developed dynamic linewidth measurement technique.
Demonstrated that the measurement technique accurately assesses laser phase noise and linewidth contributions.
Showed that a DSDBR laser can achieve a minimum linewidth within 50 nanoseconds of a wavelength switching event.

Conclusions:

The digital intradyne coherent receiver-based dynamic linewidth measurement technique is effective for characterizing tunable lasers.
Fast switching tunable DSDBR lasers exhibit rapid stabilization, achieving minimal linewidth shortly after wavelength changes.
This research contributes to the optimization of tunable lasers for advanced WDM systems.