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Related Experiment Video

Updated: Nov 17, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Cascaded SSB comb generation using injection-locked seed lasers.

Nobuhide Yokota, Hiroshi Yasaka

|February 12, 2021

Summary

We present a new method for generating single side band (SSB) combs, enhancing carrier-to-noise ratio (CNR) for wider bandwidths. This technique improves CNR by up to 11.3 dB using injection locking.

Area of Science:

Optoelectronics
Laser Physics
Signal Processing

Background:

Carrier-to-noise ratio (CNR) degrades in single side band (SSB) comb generation as bandwidth increases.
Improving CNR is crucial for applications requiring wide-bandwidth optical frequency combs.

Purpose of the Study:

To investigate a novel cascaded SSB comb generation technique.
To enhance the carrier-to-noise ratio (CNR) of wide-bandwidth SSB combs.

Main Methods:

Utilizing wavelength-multiplexed seed lasers modulated in a recirculating frequency shifter loop.
Employing a single side band (SSB) modulator, Er-doped fiber amplifier, and fiber Bragg grating for injection locking (IL).
Synchronizing seed lasers via the reflective notch filter property of the fiber Bragg grating.

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Main Results:

Demonstrated a maximum CNR improvement of 11.3 dB under injection locking (IL) conditions.
Successfully improved the CNR of wide-bandwidth SSB combs.
Validated the effectiveness of the proposed cascaded SSB comb generation technique.

Conclusions:

The proposed cascaded SSB comb generation method effectively enhances CNR for wide bandwidths.
Injection locking (IL) is a key factor in achieving significant CNR improvement.
This technique offers a viable solution for high-quality wide-bandwidth optical frequency comb generation.