Optical switch

About: Optical switch is a research topic. Over the lifetime, 28538 publications have been published within this topic receiving 351176 citations.

20 Gb/s all-optical XOR with UNI gate

Abstract: All-optical Boolean XOR is demonstrated on a 20 Gb/s pseudodata pattern using a semiconductor optical amplifier-based ultrafast nonlinear interferometer (UNI) switch. Bit pattern switching with low-pattern dependence and low switching energies is achieved.

Input switch configuration suitable for rail-to-rail operation of switched-opamp circuits

Abstract: A switch configuration to be used at the input of switched op amp circuits is introduced. The circuit is an extension of the gate-source bootstrapping technique such that rail-to-rail operation of the input switch becomes possible. Simulations show the usefulness of the proposed circuit down to 0.9 V.

Spectrally Efficient Long-Haul WDM Transmission Using 224-Gb/s Polarization-Multiplexed 16-QAM

Abstract: We discuss the generation, wavelength-division-multiplexed (WDM) long-haul transmission, and coherent detection of 224-Gb/s polarization-division-multiplexed (PDM) 16-ary quadrature amplitude modulation (16-QAM) at a line rate of 28 Gbaud. We measure a required optical signal-to-noise ratio of 23.4 dB (0.1-nm reference bandwidth; 10-3 bit-error ratio), 3.4-dB off the theoretical limit. Using ultra-large-area fiber, we achieve 2000-km single-channel transmission. We also demonstrate 1200-km WDM transmission on a 50-GHz grid (4-b/s/Hz spectral efficiency), including three passes through a wavelength-selective switch.

Gain-induced switching in metal-dielectric-metal plasmonic waveguides

Abstract: guide and manipulate light at deep subwavelength scales. 1 In plasmonic waveguides, the propagation length of the supported optical modes is limited by the material loss in the metal. The use of gain media has been suggested as a means to compensate for the material loss or to amplify surface plasmons. 2,3 Such use of gain media has been demonstrated experimentally. 4,5 It has also been suggested that the incorporation of media with realistic gain coefficients in plasmonic devices can lead to low-attenuation or even lossless propagation of surface plasmons in plasmonic waveguides, 6‐8 increase of the resolution of negativerefractive-index near-field lenses, 9 and control of the group velocity of nanoscale plasmonic waveguides. 10 In this letter, we introduce a different use of gain in plasmonic devices. We show that the incorporation of gain media in only a selected device area can annul the effect of material loss and enhance the performance of loss-limited plasmonic devices. In addition, we demonstrate that optical gain provides a mechanism for on/off switching in metaldielectric-metal MDM plasmonic waveguides. The proposed gain-assisted plasmonic switch consists of a subwavelength MDM plasmonic waveguide side coupled to a cavity filled with semiconductor material. In the absence of optical gain in the semiconductor material filling the cavity, an incident optical wave in the plasmonic waveguide remains essentially undisturbed by the presence of the cavity. Thus, there is almost complete transmission of the incident optical wave through the plasmonic waveguide. In contrast, in the presence of optical gain in the semiconductor material filling the cavity, the incident optical wave is completely reflected. We show that the principle of operation of such gain-assisted plasmonic devices can be explained using a temporal coupled-mode theory. We also show that the required gain coefficients are within the limits of currently available semiconductor-based optical gain media. We consider a subwavelength gold-air-gold MDM plasmonic waveguide side coupled to a rectangular cavity 11,12