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Related Experiment Video

Updated: Jun 10, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Self-referenced characterization of optical frequency combs and arbitrary waveforms using a simple, linear,

V R Supradeepa¹, Christopher M Long, Daniel E Leaird

¹School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA. supradeepa@purdue.edu

|August 20, 2010

Summary

We present a simple spectral shearing interferometry method for characterizing optical frequency combs and arbitrary waveforms. This technique accurately measures amplitude, phase, and fiber dispersion using minimal equipment, even at low power levels.

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Area of Science:

Optics and Photonics
Waveform Characterization
Interferometry

Background:

Characterizing optical frequency combs and arbitrary waveforms is crucial for advanced optical systems.
Existing methods can be complex or require specialized equipment.
Accurate amplitude and phase information is essential for metrology and communications.

Purpose of the Study:

To introduce a simple, linear, zero-delay spectral shearing interferometry technique.
To enable robust amplitude and phase characterization of optical frequency comb sources.
To demonstrate measurement of dispersion and dispersion slope in long fiber lengths.

Main Methods:

Implementation of spectral shearing interferometry with an intensity modulator and optical spectrum analyzer.
Characterization of two high repetition rate (approx. 10 GHz) frequency comb sources.
Exploitation of long coherence lengths and self-referenced measurements for dispersion analysis.

Main Results:

Successful amplitude and phase characterization of two distinct frequency comb sources.
Demonstration of the technique's effectiveness at average power levels down to 100 nW.
Accurate single-ended measurement of dispersion and dispersion slope in over 25 km of optical fiber.

Conclusions:

The developed spectral shearing interferometry is a simple and effective tool for optical waveform characterization.
The technique is versatile, applicable to frequency combs and dispersion measurements.
Its low power requirement and ease of implementation make it suitable for various applications.