Topic
Extinction ratio
About: Extinction ratio is a research topic. Over the lifetime, 8541 publications have been published within this topic receiving 111908 citations.
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TL;DR: In this paper, a sinusoidally driven InGaAsP electroabsorption modulator was applied to an inline optical gate for a 2R (reshape and retiming) repeater in optical amplifier systems, an n:1 optical demultiplexer in time division multiplexing systems, and an optical switch.
Abstract: The authors propose new applications of a sinusoidally driven InGaAsP electroabsorption modulator to an inline optical gate for a 2R (reshape and retiming) repeater in optical amplifier systems, an n:1 optical demultiplexer in time division multiplexing systems, and an optical switch. The small polarization dependence of the modulator is essential for inline use. By utilizing the monotonic increase of the extinction ratio with increasing applied voltage, the electroabsorption modulator driven by a large-signal sinusoidal voltage can produce a time domain square-shaped gate function with variable gate width. Furthermore, amplified spontaneous emission noise of optical amplifier systems can be reduced in both time and wavelength domains at the off-state of the modulator, due to noninterferometric wide wavelength operation of the modulator. Experimental results for a 2R repeater, an n:1 (n=4, 8) optical demultiplexer, and optical gates for switching are also demonstrated at over 10-Gb/s repetition rate. >
45 citations
TL;DR: It is shown that Charon microresonators can lead to 1-V half wave voltage all-polymer micrometer-scale devices with larger tolerances to coupler fabrication limitations and wider modulation bandwidths than classical ring resonators.
Abstract: We propose and demonstrate a new type of electro-optic polymeric microring resonators, where the shape of the transmission spectrum is controlled by losses and phase shifts induced at the asymmetric directional coupler between the cavity and the bus waveguide. The theoretical analysis of such Charon microresonators shows, depending on the coupler design, three different transmission characteristics: normal Lorentzian dips, asymmetric Fano resonances, and Lorentzian peaks. The combination of the active azo-stilbene based polyimide SANDM2 surrounded by the hybrid polymer Ormocomp allowed the first experimental demonstration of electro-optic modulation in Charon microresonators. The low-loss modulators (down to 0.6 dB per round trip), with a radius of 50µm, were produced by micro-embossing and exhibit either highly asymmetric and steep Fano resonances with large 43-GHz modulation bandwidth or strong resonances with 11-dB extinction ratio. We show that Charon microresonators can lead to 1-V half wave voltage all-polymer micrometer-scale devices with larger tolerances to coupler fabrication limitations and wider modulation bandwidths than classical ring resonators.
45 citations
TL;DR: In this paper, an active mode-locking of a fiber laser with an all-fiber electrooptic modulator was demonstrated, where a 1.4-V driving signal was used, creating subnanosecond single pulses at the fundamental frequency of the cavity (12 MHz).
Abstract: Active mode-locking of a fiber laser with an all-fiber electrooptic modulator is demonstrated. A 1.4-V driving signal was used, creating subnanosecond single pulses at the fundamental frequency of the cavity (12 MHz). The modulator was a packaged Mach-Zehnder interferometer incorporating a poled twin-hole fiber in one of the arms. The switching voltage was 230 V at 1550 nm, with extinction ratio /spl sim/20 dB. The interferometer could be electrooptically tuned by 3.5 nm.
45 citations
TL;DR: In this article, a SILC-BLD was used to improve the bit error rate of degraded optical signals by converting the signal wavelength at the same time without wavelength filters or isolators.
Abstract: Digital optical signal regeneration with a SILC-BLD markedly improves the bit error rate of degraded optical signals. The extinction improved from 3 dB to 17 dB and intensity fluctuation was suppressed from 3 dB to 0 dB. This diode can not only regenerate the signal but also converts the signal wavelength at the same time without wavelength filters or isolators. >
45 citations
08 May 2006
TL;DR: In this paper, the use of the Faraday effect in a optical on-off switch is investigated for application in wide spread usage in fiber networks, which is the first reported magneto-optic switch for optical fiber networks.
Abstract: In this paper, the use of the Faraday effect in a optical on-off switch is investigated for application in wide spread usage in fiber networks. This is the first reported magneto-optic switch for optical fiber networks. Light does not exit from the fiber except when propagating into the MO rotator, thus this is an all fiber switch. The extinction ratio was stabilized and faster switching was observed when the domain walls are pinned and only rotation occurred. Integrated magnetooptics is the final frontier for the improvement of the device characteristics as well as the commercialization of such a magneto-optic switch. Finally the issues of implementation and operation of the integrated magneto-optical switch and the techniques of growing high quality garnet thin films for this purpose are demonstrated.
45 citations