Chinese Optics Letters, Volume. 17, Issue 6, 060603(2019)
Microwave photonic filter design and optimization based on stimulated Brillouin scattering using a directly modulated pump
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Fig. 1. Experimental setup for realizing the rectangular SBS filter. PC, polarization controller; AWG, arbitrary waveform generator; DML, directly modulated laser; EDFA, erbium-doped fiber amplifier; TLS, tunable laser source; MZM, Mach–Zehnder modulator; FBG, fiber Bragg grating; ISO, isolator; EVNA, electrical vector network analyzer; PD, photodiode; ATT, optical attenuator.
Fig. 2. In-band gain ripple and average current waveform repetition period relation with different fiber lengths of 0.2, 10.2, 20.4 km.
Fig. 3. Gain profile versus frequency at different current waveform repetition periods, including (a) 100 ns, (b) 33 ns, (c) 20 ns, (d) 14.29 ns, (e) 12.5 ns, (f) 10.53 ns, (g) 9.091 ns, (h) 8.33 ns, (i) 6.25 ns, (j) 5 ns, (k) 2.5 ns, and (l) 2 ns.
Fig. 4. Relation between temporal current waveform and chirped light spectrum of DML.
Table 1. Comparison Between External Modulation Scheme and Direct Modulation Scheme
View tableView in ArticleTable 1. Comparison Between External Modulation Scheme and Direct Modulation Scheme
Type External modulation[ 13 ,15 ,19 ]Direct modulation[ 18 ]Key composition Laser + electrical hybrid + IQ modulator + bias control + high sampling rate DAC DML + low sampling rate DAC Steep edges Better selectivity Slightly less steep Bandwidth Theoretic maximum at 1/2 DAC bandwidth Limited by driving current amplitude range Requirements for DAC High bandwidth (double the filter bandwidth) Relatively low bandwidth (always no more than 500 MHz despite the filter bandwidth) High-frequency sweeping speed for short fibers No requirements for sweeping speed Application scenario High precision Cost sensitive Narrow bandwidth Wide bandwidth Long fiber Ultrashort fiber or waveguides
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Kai Hu, Lilin Yi, Wei Wei, Weisheng Hu, "Microwave photonic filter design and optimization based on stimulated Brillouin scattering using a directly modulated pump," Chin. Opt. Lett. 17, 060603 (2019)
Paper Information
Category: Fiber Optics and Optical Communications
Received: Jan. 3, 2019
Accepted: Mar. 14, 2019
Published Online: Jun. 5, 2019
The Author Email: Lilin Yi (lilinyi@sjtu.edu.cn)
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