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High extinction ratio optical pulse characterization method via single-photon counting.

Benoit Vanus, Chams Baker, Liang Chen

|December 28, 2020

Summary

This summary is machine-generated.

Researchers developed a photon counting method to characterize high extinction ratio (ε) optical pulses. This technique achieved a 120.1 dB extinction ratio, significantly advancing optical sensing capabilities.

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Area of Science:

Photonics and Optical Engineering
Nonlinear Optics
Quantum Optics

Background:

Traditional optical pulse characterization methods are limited to extinction ratios of 60 dB.
High extinction ratio (ε) optical pulses are crucial for advanced sensing applications.

Purpose of the Study:

To present a novel photon counting technique for characterizing high extinction ratio (ε) square optical pulses.
To demonstrate the generation and measurement of optical pulses with unprecedented extinction ratios.

Main Methods:

Generation of high-ε pulses by modulating sinusoidal signals and inducing self-phase modulation (SPM) via the nonlinear Kerr effect.
Extraction of an SPM-generated sideband from the modulated optical signal.
Photon counting to measure the extinction ratio at the peak and pedestal of the generated pulse.

Main Results:

Characterization of a 10 ns Kerr-generated optical pulse with a 120.1 dB extinction ratio.
Demonstration of achieving a 120.1 dB extinction ratio from an initial 20-dB extinction ratio pulse using a conventional electro-optic modulator.

Conclusions:

The developed photon counting technique enables accurate characterization of high extinction ratio (ε) optical pulses beyond conventional limits.
These high-ε pulses have significant potential for long-range distributed vibration sensing in optical time-domain reflectometry (OTDR) and high-Q microring sensors.