Faraday Rotator Mirror Research Articles

Single-frequency and polarization-stable oscillation of Fabry-Perot fiber laser using a nonpolarization-maintaining fiber and an intracavity etalon

We propose a novel configuration of Fabry-Perot fiber lasers for achieving single-frequency and polarization-stable oscillation. The laser consists of a nonpolarization-maintaining active fiber, Faraday rotator mirrors, and a specially designed intracavity frequency-selective element. An erbium-doped fiber laser is actually constructed according to the cavity design, and we can observe stable single longitudinal-mode oscillation.

Polarization properties of a reflective fiber amplifier employing a circulator and a Faraday rotator mirror

We present a detailed study of the polarization properties of a reflective fiber amplifier composed of a circulator, a normal single-mode Er-doped fiber and a Faraday rotator mirror. The amplifier can preserve an arbitrary input state of polarization regardless of any external perturbations, and is completely free from polarization effects. The effect of imperfections of the Faraday rotator mirror is also discussed. Finally, we demonstrate experimentally the polarization-stability of the amplifier and its ability to compensate polarization mode dispersion both in the circulator and in the single-mode Er-doped fiber.

All optical tree network for interference-free distancemultiplexing

Distance multiplexing for TDMA operation is applied to a tree network structure in an all optical LAN. In conjunction with Faraday rotator mirrors for reflection modulation and with a polarisation beam-splitter at the tree root, multiple reflection interference is completely eliminated.

Polarization-induced noise in a fiber-optic Michelson interferometer with Faraday rotator mirror elements

Faraday rotator mirror elements have been used in a number of applications as compensators for induced birefringence in retracing paths. In interferometric systems, such as the fiber-optic Michelson interferometer, this approach proved to be useful in providing maximum fringe visibility and insensitivity to the polarization state of light injected into the interferometer. However, it is found that, when the characteristics of the fiber coupler depend on the polarization state of the input beam, the efficiency of the Faraday mirror elements is limited. Theoretical analysis and experimental results in support of this statement are presented.

Time-division multiplexing of polarization-insensitive fiber-optic Michelson interferometric sensors

A system of time-division multiplexing of polarization-insensitive fiber-optic Michelson interferometric sensors that uses Faraday rotator mirror elements is demonstrated. This system is constructed with conventional low-birefringence single-mode fiber and is able to solve the polarization-fading problem by a combination of Faraday rotator mirrors with unbalanced Michelson interferometers. The system is lead-fiber insensitive and has potentials for practical field applications.

Suppression of polarisation hole burning in an EDFAusing anunpolarised source

Suppression of polarisation hole burning in the erbium-doped fibre amplifier (EDFA) is demonstrated by converting a polarised signal into an unpolarised signal using a Michelson interferometer which consists of a polarisation beamsplitter and two Faraday rotator mirrors.

Polarization insensitive fibre-optic white-light interferometry

Interferometric systems consisting of two tandem interferometers with white-light illumination have been used as optical-fibre remote-sensing systems. Recently, it has been shown that both phase and amplitude of the output signal are significantly affected by externally induced birefringence in the fibre linking the interferometers; in some cases, this may cause total fading of the interference signal. In this letter, a new scheme is proposed to overcome this problem in white-light fibre-optic interferometric sensors. The approach is based on birefringence compensation using Faraday rotator mirror elements. The principle is experimentally verified, and the results confirm the theoretical expectation.

Reflective fiber ring resonator with polarization-independent operation

A polarization-insensitive fiber-optic ring-resonator configuration based on a reflective mode of operation with a Faraday rotator mirror for birefringence compensation is reported. An output resonant-dip transfer function that is independent of the input polarization to the system is obtained, which is shown to produce a stable scale factor of the system.

Polarisation-insensitive fibre optic Michelson interferometer

A polarisation-insensitive fibre optic Michelson interferometric sensor configuration is demonstrated. The approach is based on the use of birefringence compensation in a retraced fibre path using Faraday rotator mirror elements.< >