All-Fiber Ultra-Wideband Electro-Optical Frequency Comb

Ruicheng Zhao; Jianping Li; Yuwen Qin

doi:10.3788/AOS240810

Acta Optica Sinica, Volume. 44, Issue 20, 2006003(2024)

All-Fiber Ultra-Wideband Electro-Optical Frequency Comb

Ruicheng Zhao^1,2, Jianping Li^1,2、*, and Yuwen Qin^1,2

¹Institute of Advanced Photonics Technology, School of Information Engineering, Guangdong University of Technology, Guangzhou 510000, Guangdong , China

²Key Laboratory of Photonic Technology for Integrated Sensing and Communication, Ministry of Education, Guangdong Provincial Key Laboratory of Information Photonics Technology, Guangdong University of Technology, Guangzhou 510000, Guangdong , China

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Abstract Get PDF(in Chinese)

Figures & Tables(8)

Fig. 1. Schematic diagram of basic principle

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Fig. 2. Experimental scheme (CW: continuous wave; IM: intensity modulator; PM: phase modulator; SMF: single-mode fiber; EDFA: erbium-doped fiber amplifier; HNLF: highly nonlinear fiber; NOLM: nonlinear-optical loop mirror)

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Fig. 3. Simulation results. (a) Temporal waveform of seed frequency comb; (b) temporal waveform after SMF compression; (c) temporal waveform before frequency mixing; (d) output spectrum of seed frequency comb; (e) spectrum of broadband frequency comb

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Fig. 4. Output results of seed frequency comb. (a) Output spectrum; (b) time-domian waveform

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Fig. 5. Results of time domain shaping. (a) Autocorrelation trace after SMF compression; (b) autocorrelation trace after NOLM; (c) output spectrum after NOLM

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Fig. 6. Results of frequency domain shaping. (a) Schematic of waveshaper; (b) frequency filtering curve; (c) dispersion control curve; (d) autocorrelation trace before frequency mixing; (e) output spectrum after waveshaper

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Fig. 7. Output spectra of broadband frequency comb. (a) Entire spectrum with 0.02 nm resolution; (b) entire spectrum with 0.2 nm resolution; (c) spectral details in part of the S, C and L bands

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Table 1. Main parameters

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Table 1. Main parameters

Device	Parameter
SMF	Second order dispersion $β_{2}$ =-22.9850 ps²/km
HNLF	Second order dispersion $β_{2}$ =1.1479 ps²/km, third order dispersion $β_{3}$ =0.0062 ps³/km, nonlinear coefficient $γ$ =11 km/W
EDFA (before NOLM)	Output power: 30.5 dBm
NOLM coupler	Coupling ratio is 60∶40, pigtail length is 0.2 m
Waveshaper	Filter range is 1535‒1600 nm
EDFA (after NOLM)	Output power is 34.0 dBm