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학술지 Highly Flat Optical Frequency Comb Generation based on Pulse Carving and Sinusoidal Phase Modulation
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저자
Thanh T. Tran, 송민제, 송민협, 서동선
발행일
201907
출처
Optical Engineering, v.58 no.7, pp.1-8
ISSN
0091-3286
출판사
SPIE
DOI
https://dx.doi.org/10.1117/1.OE.58.7.076103
협약과제
19HB2700, 멀티밴드 신호전송을 위한 다중 광채널 발생/조형 기술 개발, 송민협
초록
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.
KSP 제안 키워드
Dual-drive, Dual-parallel Mach-Zehnder modulator(DPMZM), Mach-Zehnder(MZ), Optical frequency comb generation, Optical pulse, Phase modulation technique, Pulse shape, Sinusoidal phase modulation, Three-Phase, Time lens, high flatness