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Chinese Physics Letters

Optical Bistability by Using a Tunable Fibre Laser with Fibre Fabry–Perot

Guohui Lv, Hongan Ye, Junqing Li, Sun Xiu-Dong, Xinming Zhang

Published Oct 27, 2004• 6 citations
Publisher

Abstract

We observe a novel hybrid optical bistability by using an electro-optically tuned cw fibre laser with a fibre Fabry–Perot filter. The principles of the optical bistable device in two operation manners are analysed. The applications in monitoring the wavelength shift of a tunable fibre laser and fibre sensor of digital type are also discussed.

DOI
10.1088/0256-307x/21/11/035

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Traditional frequency domain optical bistability(FDOB) devices with hybrid electro-optical feedback have low response speed and high noise fluctuations.Hence,a novel tunable laser FDOB device with an all-optical feedback was developed using a nonlinear fiber ring resonator as the frequency feedback element.Parametric equations of optical bistability were established according to the system's response to nonlinear process and frequency-dependent feedback.Based on the parametric equations,the characteristics and controllable operations of FDOB were analyzed.The switching response speed of the optical bistability was discussed.The analysis showed that the proposed all-fiber laser bistability device can effectively achieve intensity-driven and gain-driven optical bistability.The position and shape of the bistability hysteresis curve vary with the adjustment of gain or loss in the fiber ring resonator,hence realizing the controlled all-optical bistability operations.Sudden jumping of optical bistability in the frequency domain can be applied to monitor laser wavelength shift and achieve sensoring.The optical bistability response time is in the nanosecond order of magnitude and bistability switching is ultrafast.
We propose a novel optical bistable device (OBD) in frequency-domain with which we can perform optical bistable operations in a number of fibre Bragg gratings (FBGs) which are included in the same OBD. Such an OBD may bring more opportunities in applications and, as an example, we show the possibility of using it in an FBG sensor demodulating system. By use of a tunable light source, consisting of a broad band source and a scanning fibre F–P (FFP), we demonstrate the above-mentioned operations experimentally.