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Ultrahigh supermode noise suppressing ratio of a semiconductor optical amplifier filtered harmonically mode-locked Erbium-doped fiber laser

Gong-Ru Lin, Ming-Chung Wu, Yung-Cheng Chang, and Ci-Ling Pan

Open Access Open Access

Abstract

The supermode noise suppressing ratio (SMSR) and the phase noise of a harmonically mode-locked Erbium-doped fiber laser (HML-EDFL) with an intra-cavity semiconductor optical amplifier (SOA) and an optical band-pass filter (OBPF) are improved and compared with a state-of-the-art Fabry-Perot laser diode (FPLD) injection-mode-locked EDFL. By driving the intra-cavity SOA based high-pass filter at unitary gain condition, the SMSR of the HML-EDFL is enhanced to 82 dB at the cost of degrading phase noise, increasing jitter, and broadened pulsewidth. The adding of OBPF further improves the SMSR, pulsewidth, phase noise, and jitter of the SOA-filtered HML-EDFL to 90 dB, 42 ps, -112 dBc/Hz, and 0.7 ps, respectively. The ultrahigh SMSR of the SOA-filtered HML-EDFL can compete with that of the FPLD injection-mode-locked EDFL without sacrificing its pulsewidth and jitter performances.

©2005 Optical Society of America

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Figures (9)
Fig. 1.
Fig. 1. The schematic diagrams of the (a) HML-EDFL and (b) SOA-and-OBPF-filtered HML-EDFL. PC: polarization controller; OC: optical coupler; EDFA: Erbium-doped fiber amplifier; MZM: Mach-Zehnder intensity modulator; SOA: semiconductor optical amplifier; OBPF: optical bandpass filter.

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Fig. 2
Fig. 2 The schematic diagram of the EDFL mutually injection-mode-locked with a gain-switched FPLD. Comb: Electrical pulse generator; FPLD: Fabry-Perot laser diode.

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Fig. 3.
Fig. 3. The peak power (solid up-triangle) and pulsewidth (solid square) as a function of detuning frequency for (a) the HML-EDFL and (b) the FPLD-IML-EDFL systems.

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Fig. 4.
Fig. 4. (a) Supermode noise spectrum (left) and pulse shape (right) of the HML-EDFL (upper part) and the HML-EDFL with intra-cavity SOA and OBPF (lower part). (b) The supermode noise spectra measured at resolution bandwidth of (1) 1 Hz; (2) 10 Hz; and (3) 100 kHz.

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Fig. 5.
Fig. 5. (a) The pulse shapes and (b) the supermode noise spectrum (RBW = 1 Hz) of (1) the free-running FPLD, and (2) the FPLD-IML-EDFL.

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Fig. 6.
Fig. 6. (a) The SSB phase noise spectra and (b) the timing jitter of (1) the free-running FPLD and (2) the FPLD-IML-EDFL.

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Fig. 7
Fig. 7 (a) The SSB phase noise in HML-EDFL (1) without SOA, (2) with SOA and (3) with SOA and OBPF; (b) the timing jitter in HML-EDFL (1) without SOA, (2) with SOA and (3) with SOA and OBPF.

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Fig. 8.
Fig. 8. The SMSR and the SSB phase noise of (a) the HML-EDFL with SOA and (b) the HML-EDFL with SOA and OBPF at different SOA currents.

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Fig. 9.
Fig. 9. The simulated (solid line) and measured SSB phase noises as a function of the SOA gain for the SOA-filtered EDFL without (solid square) and with OBPF (up triangle).

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Tables (1)

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Table 1. Comparisons on performances of versatile EDFL systems

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Equations (3)

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σ ( f ) = 1 2 π f 0 { 2 ∫ f L f H [ ( [ 10 L n ( f ) 10 − 10 L 1 ( f ) 10 ] ( n 2 − 1 ) ) ] df } 1 2
d Δ g dt + Δ g ( 1 τ c + p in · e g 0 E sat ) = − Δ P in E sat ( e g 0 − 1 ) ,
R = Δ P out P out Δ P in P in = [ 1 − ( 1 − e − g 0 ) × e g 0 P avg E sat × 1 τ c ′ [ 1 τ c ′ ] 2 + Δ ω 2 ] 2 + [ ( 1 − e − g ) × e g 0 P avg E sat × Δ ω [ 1 τ c ′ ] 2 + Δ ω 2 ] 2 ,

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