Abstract

In this paper, we present a novel Brillouin fiber-ring laser utilizing an unbalanced Mach-Zehnder interferometer (UMZI) as coupling device. The laser is pumped by a distributed-feedback laser diode and shows continuous-wave and single-frequency operation. Frequency-dependent transmission characteristics of the UMZI make it possible for the pump wave to pass through the laser-ring cavity with no resonance effect for stable pump operation,while the Brillouin laser signal still resonates in a high-finesse cavity. Single and multiple longitudinal mode operations are observed according to the relative location between longitudinal modes and Brillouin gain-curve center. A stable single-frequency operation is achieved using a simple stabilizing feedback loop based on dithering and autotracking techniques. Using this simple stabilizing feedback loop, the laser-intensity fluctuation is highly suppressed and remains below 4%. The Brillouin output converted from the pump power of 26.4 mW is about 3.18 mW, and the linewidth is measured to be below 1 kHz.

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Appl. Opt. (1)

J. Lightwave Technol. (8)

M. Niklès, L. Thévenaz and P. A. Robert, "Brillouin gain spectrum characterization in single-mode optical fibers", J. Lightwave Technol., vol. 15, pp. 1842-1851, 1997.

M. Tateda, T. Horiguchi, T. Kurashima and K. Ishihara, "First measurement of strain distribution along field-installed optical fibers using Brillouin spectroscopy", J. Lightwave Technol., vol. 8, pp. 1296-1272, 1990.

G. J. Cowle, D. Y. Stepanov and Y. T. Chieng, "Brillouin/erbium fiber lasers", J. Lightwave Technol., vol. 15, pp. 1198-1204, 1997.

Y. Tanaka and K. Hotate, "Analysis of fiber Brillouin ring laser composed of single-polarization single-mode fiber", J. Lightwave Technol., vol. 15, pp. 838-844, 1997.

P.-A. Nicati, K. Toyama and H. J. Shaw, "Frequency stability of a Brillouin fiber ring laser", J. Lightwave Technol., vol. 13, pp. 1445-1451, 1995.

A. Küng, L. Thèvenaz and P. A. Robert, "Polarization analysis of Brillouin scattering in a circularly birefringent fiber-ring resonator", J. Lightwave Technol., vol. 15, pp. 977-982, 1997.

M. O. Deventer and A. J. Boot, "Polarization properties of stimulated Brillouin scattering in single-mode fibers", J. Lightwave Technol., vol. 12, pp. 585-590, 1994.

A. R. Chraplyvy, "Limitations in lightwave communications imposed by optical-fiber nonlinearities", J. Lightwave Technol., vol. 10, pp. 1548-1557, 1990.

Opt. Lett. (8)

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