Mode scrambler

About: Mode scrambler is a research topic. Over the lifetime, 896 publications have been published within this topic receiving 13595 citations.

Recording and playback apparatus and optical head

Abstract: The light intensity of a light beam emitted from a light source is appropriately controlled when the light beam is transmitted through a variable optical coupling efficiency device in an optical head. During a read mode, the light beam from the light source is incident on an optical disk at an intensity relatively weaker than that of the light source. By switching the optical coupling efficiency of the variable optical coupling efficiency device between a write mode and a read mode, the light intensity directed to an optical recording medium is substantially varied from the write mode to the read mode. This arrangement eliminates the need for substantially increasing the optical output power ratio of the light source of write power to read power.

Fiber tail assembly with optical signal tap

Abstract: A method and optical tap is provided for forming a monitor signal that is a measure of optical power in a guided mode output of an optical modulator. The method and optical tap may monitor the guided mode power without tapping the guided mode light, even when optical power of the radiation modes is non-complementary to that of the output mode. Light from the radiation modes of the optical modulator is coupled into the wall of a capillary through a front face. Separate portions of the radiation mode light are reflected into photodetectors, which form photocurrents that are incoherently added to form the monitor signal.

Bend resistance of large-mode-area higher-order-mode fibers

Abstract: Higher-order-mode fibers with very large mode area are shown to be naturally resistant to bend induced mode distortion, an important limitation on amplifier fibers. Simulations and measurements display resistance of these fibers to bending.

Design of differential mode wideband bandpass filter with Common mode suppression using modified branch line coupler

Abstract: In this paper, application of branch line coupler to design a differential mode wideband bandpass filter and to suppress common mode noise is proposed. The schematic contains one modified branch line coupler with centrally loaded open circuited stubs in the symmetrical plane to achieve high attenuation under common mode excitation. First differential mode and common mode circuits are analyzed separately for the proposed schematic and then quantitative approach, based on distributed transmission line method is proposed to explain the simulated frequency response of differential filter. No via hole is required to design differential filter, is other advantage for fabrication of the filter. A 65 % fractional bandwidth (FBW) is calculated at 5.7 GHz Centre frequency and Common mode attenuation (CMRR), greater than 13 dB is calculated under the differential passband bandwidth.

Fast polarization scrambler based on chaotic dynamics in optical fibers

Abstract: We report a polarization scrambler based on the nonlinear interaction in optical fibers between a forward beam and its backward replica amplified by a reflective-loop. The output polarization exhibits a fast chaotic dynamics and was tested on a 10-Gbit/s signal.