Widely linewidth tunable lasers through cascaded four-wave mixing based phase modulation amplification

Vikram, BS and Prakash, R and Supradeepa, VR (2021) Widely linewidth tunable lasers through cascaded four-wave mixing based phase modulation amplification. In: Journal of Optics (United Kingdom), 23 (2).

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Abstract

We demonstrate wide-range linewidth-tuning of a narrow-linewidth laser in the C-band up to 40 GHz through cascaded four-wave mixing (CFWM) based phase modulation amplification. Stimulated Brillouin scattering (SBS) severely limits the power scaling of narrow-linewidth lasers. Continuous tuning of the linewidth or temporal coherence of the laser to mitigate SBS is conventionally achieved through external phase modulation with white noise or other RF waveforms. However, the range of linewidth tuning is limited by the bandwidth and power of the electro-optic modulator. We overcome this through the use of FWM as a linewidth multiplier. To achieve linewidth multiplication, two tunable pumps line-broadened in electro-optic phase modulators with white noise are power scaled and propagated through highly nonlinear fiber. We achieve linewidth tuning up to �4 GHz using control of the noise waveform, while CFWM achieves a 10� multiplication of linewidth up to 40 GHz at a fixed wavelength. Linewidth tuning can be further scaled through power scaling or cascading multiple nonlinear stages. The proposed technique would be useful in nonlinearity control in narrow-linewidth laser amplifiers, high-resolution optical imaging, LIDAR, and infrared spectroscopy. © 2021 IOP Publishing Ltd.

Item Type:	Journal Article
Publication:	Journal of Optics (United Kingdom)
Publisher:	IOP Publishing Ltd
Additional Information:	The copyright for this article belongs to IOP Publishing Ltd
Keywords:	Four wave mixing; Infrared spectroscopy; Modulators; Optical radar; Phase modulation; Stimulated Brillouin scattering; Tuning; White noise, Cascaded four-wave mixing; Electro-optic modulators; Electrooptic phase modulator; High resolution optical imaging; Highly nonlinear fibers; Narrow linewidth lasers; Stimulated Brillouin Scattering (SBS); Temporal coherence, Linewidth
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	04 Jul 2021 05:40
Last Modified:	04 Jul 2021 05:40
URI:	http://eprints.iisc.ac.in/id/eprint/68731

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