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Optical modulator
About: Optical modulator is a research topic. Over the lifetime, 14068 publications have been published within this topic receiving 196932 citations.
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22 Oct 1990TL;DR: In this article, a system incorporating a pair of Mach-Zehnder modulators (164, 166) for performing amplitude modulation of an optical carrier is disclosed, each of the modulators is designed to suppress even order distortion products and develop third order distortion product of opposite sign and equal magnitude.
Abstract: A system incorporating a pair of Mach-Zehnder modulators (164, 166) for performing amplitude modulation of an optical carrier is disclosed. Each of the modulators is designed to suppress even order distortion products and develop third order distortion products of opposite sign and equal magnitude. The outputs of the two modulators are combined in a directional coupler (155) resulting in substantially suppressing second through fourth order distortion products.
44 citations
TL;DR: Active alignment of a 1 x 8 free-space optical switch was studied experimentally and it was found that such switches can adapt to possible geometrical changes and light wavelength drift during operation.
Abstract: Active alignment of a 1 x 8 free-space optical switch was studied experimentally. Optical signals, carried on single-mode fibers, were switched by a ferroelectric liquid-crystal-on-silicon spatial light modulator. Continuous measurement of the in-coupled power to the fibers provided feedback for the switch control. The switch automatically located and locked to the output fibers. An advantage with adaptive switches of a similar kind is relaxed geometrical tolerances in the switch assembly. Further, such switches can adapt to possible geometrical changes and light wavelength drift during operation.
44 citations
TL;DR: In this paper, a 1.55-mu m lambda/4-shifted distributedfeedback (DFB) laser/InGaAsP electroabsorption modulator integrated light sources are reported.
Abstract: High-speed, low-chirp, and low voltage driving characteristics of 1.55- mu m lambda /4-shifted distributed-feedback (DFB) laser/InGaAsP electroabsorption modulator integrated light sources are reported. By optimization of the composition and thickness of the modulator waveguide, the driving voltage for a 10-dB extinction ratio was reduced to 1.4-3 V, depending on the modulator length in the range of 240-125 mu m. High-speed modulation up to 10-Gb/s NRZ modulation was achieved by the integrated device with a 125- mu m modulator length. The linewidth enhancement factor of the integrated modulator was estimated to be 0.15-0.48. >
44 citations
TL;DR: In this paper, the frequency response of optical receivers can be accurately calibrated by measuring a heterodyne signal generated by mixing two Nd:YAG ring lasers, where one laser signal passes through the modulator while the other functions as a local oscillator to convert one of the sidebands of the modulated carrier to a fixed intermediate signal.
Abstract: A description is given of how the frequency response of optical receivers can be accurately calibrated by measuring a heterodyne signal generated by mixing two Nd:YAG ring lasers. One laser signal passes through the modulator while the other functions as a local oscillator to convert one of the sidebands of the modulated carrier to a fixed intermediate signal. This heterodyne system offers more than 50 dB of dynamic range. Calibration of both optical phase and amplitude modulators is achieved. The technique presented eliminates the need for a high-speed photoreceiver, has a good signal-to-noise ratio, and makes measurement of phase modulator frequency response possible. >
44 citations
TL;DR: In this article, a single-sideband suppressed-carrier modulator design using a standard single-electrode Mach-Zehnder electrooptic modulator is presented.
Abstract: This letter demonstrates a novel optical single-sideband suppressed-carrier modulator design using a standard single-electrode Mach-Zehnder electrooptic modulator bidirectionally. It is proven that its single-sideband operation is insensitive to bias and optical modulation depth. Up to 25 dB of sideband suppression and 14 dB of optical carrier attenuation are obtained in experiments at microwave modulation frequencies. In addition, suppression of dispersion-induced power fading is demonstrated in a link with a total dispersion of 2691 ps/nm.
44 citations