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Long-term stabilization of a 10 GHz 0.8 ps asynchronously mode-locked Er-fiber soliton laser by deviation-frequency locking

Wei-Wei Hsiang, Chien-Yu Lin, Ng Kam Sooi, and Yinchieh Lai

Open Access Open Access

Abstract

Without using high speed RF feedback electronics, we successfully demonstrate a novel and economic long-term stabilization scheme for a 10 GHz 0.8 ps asynchronously mode-locked Er-fiber soliton laser by controlling the cavity length to lock the deviation frequency at 25 kHz. The required deviation frequency between the cavity harmonic frequency and the modulation frequency can be directly obtained from the low frequency electronic sideband of the laser output. The same feedback control unit is also useable for higher modulation frequencies, because the suitable deviation frequency always remains within the range of 15~40 kHz.

©2006 Optical Society of America

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Figures (5)
Fig. 1.
Fig. 1. Schematic of the mode-locked Er-fiber laser and the feedback control. BPF, band-pass filter; PD, photodiode; DSF, dispersion shift fiber.

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Fig. 2.
Fig. 2. Characteristics of the pulses from asynchronously mode-locked fiber laser. (a) Autocorrelation trace (black solid curve) and the fitting curve (red open circles), assuming a sech2 pulse shape. (inset , optical spectrum on a linear scale). (b) RF spectrum near 10 GHz with a span of 50 MHz; SMSR > 70 dB.

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Fig. 3.
Fig. 3. Frequency sidebands observed in the electronic frequency spectra. (a) 500 kHz span, near 10 GHz. (b) 90 kHz span, near DC.δf : deviation frequency.

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Fig. 4.
Fig. 4. Deviation frequency in the electronic frequency spectrum near DC after the low-pass filter and the amplifier in the feedback loop (inset, signal in the time domain).

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Fig. 5.
Fig. 5. Stabilization of the asynchronously mode-locked fiber laser. (a) Deviation frequency shift: without the stabilization scheme, green curve with the upper axis; with the stabilization scheme, blue curve with the lower axis. (b) 10 GHz pulse train from a fast sampling oscilloscope.

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