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Single-longitudinal-mode tunable WDM-channel-selectable fiber laser

Nathaniel J. C. Libatique, Li Wang, and Ravi K. Jain

Open Access Open Access

Abstract

We report operation of a single-longitudinal-mode WDM-channel-selectable fiber laser. The use of a tunable fiber Bragg grating and a linewidth narrowing saturable absorption filter in conjunction with an intracavity etalon enabled single-frequency emission and discretely tunable WDM channel operation without the need for external wavelength locking modules. Side mode suppression ratios (SMSRs) > 50 dB have been demonstrated with ~ 3 dBm individual channel output powers for 8 channel (Δf = 50 GHz) operation of this WDM source.

©2002 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Schematic of discretely tunable WDM laser source

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Fig. 2.
Fig. 2. Laser output, as a function of LD#2 pump power Pp2, measured via Fabry-Perot interferometry with 20 MHz resolution (a) no saturable absorber (SA), Pp2 = 200 mW, highly multimode (b) with 5 m saturable absorber, Pp2 = 200 mW (c) with 5 m saturable absorber, Pp2 = 35 mW, stable singlemode output

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Fig. 3.
Fig. 3. Laser output, as a function of LD#2 pump power Pp2, measured via self-heterodyne measurements with 300 kHz resolution (a) no saturable absorber (SA), Pp2 = 200 mW, highly multimode (b) with 5 m saturable absorber, Pp2 = 200 mW, RF beating of 6 modes (c) with 5 m saturable absorber, Pp2 = 35 mW, stable singlemode output

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Fig. 4.
Fig. 4. Tunable WDM outputs at 8 individually-selected channels (Δf = 50 GHz) 3.10 dBm ± 0.05 dBm outputs, > 50 dB SMSRs

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