Highly flat optical frequency comb generation based on pulse carving and sinusoidal phase modulation

Thanh Tuan Tran; Minje Song; Minhyup Song; Dongsun Seo

doi:10.1117/1.OE.58.7.076103

11 July 2019 Highly flat optical frequency comb generation based on pulse carving and sinusoidal phase modulation

Thanh Tuan Tran, Minje Song, Minhyup Song, Dongsun Seo

Author Affiliations +

Optical Engineering, Vol. 58, Issue 7, 076103 (July 2019). https://doi.org/10.1117/1.OE.58.7.076103

Abstract

We investigate the relationship between an optical pulse shape and a time lens implemented by means of sinusoidal phase modulation. Based on this investigation, two schemes are proposed to obtain an optical frequency comb (OFC) with exceptionally high flatness and a large number of spectral lines by carving an optical pulse shape to result in a quasilinear chirp via a simple sinusoidal phase modulation technique. The first scheme utilizes an intensity modulator with a single-drive port or with dual-drive ports to carve a narrow pulse. The experimental results show very good spectral profiles with 38 OFC lines at 1.2-dB flatness and 53 lines at 1.5-dB flatness when the intensity modulator is combined with two and three phase modulators for sinusoidal phase modulation, respectively. The second scheme is implemented by replacing the intensity modulator by a dual-parallel Mach–Zehnder modulator (DP-MZM). In this case, we obtain 35 OFC lines at nearly perfect flatness of less than 1 dB and 53 lines at 1.5-dB flatness after combining the DP-MZM with two and three phase modulators, respectively.

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Thanh Tuan Tran, Minje Song, Minhyup Song, and Dongsun Seo "Highly flat optical frequency comb generation based on pulse carving and sinusoidal phase modulation," Optical Engineering 58(7), 076103 (11 July 2019). https://doi.org/10.1117/1.OE.58.7.076103

Received: 1 April 2019; Accepted: 31 May 2019; Published: 11 July 2019

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