Topic
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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TL;DR: In this article, a traveling-wave directional coupler modulator based on electro-optic polymer is presented, which is able to provide both high linearity and broad bandwidth.
Abstract: In this paper, we present the design, fabrication, and characterization of a traveling-wave directional coupler modulator based on electro-optic polymer, which is able to provide both high linearity and broad bandwidth. The high linearity is realized by introducing Δβ -reversal technique in the two-domain directional coupler. A traveling-wave electrode is designed to function with bandwidth-length product of 302 GHz·cm , by achieving low microwave loss, excellent impedance matching, and velocity matching, as well as smooth electric-field profile transformation. The 3-dB bandwidth of the device is measured to be 10 GHz. The spurious-free dynamic range of 110 dB ±3 Hz2/3 is measured over the modulation frequency range of 2-8 GHz. To the best of our knowledge, such high linearity is first measured at the frequency up to 8 GHz. In addition, a 1 × 2 multimode interference 3-dB splitter, a photobleached refractive index taper, and a quasi-vertical taper are used to reduce the optical insertion loss of the device.
83 citations
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08 May 1984
TL;DR: In this paper, a multi-spot light modulator using a laser diode is disclosed in which a single light pulse from the diode generates a multispectral image of a data pattern, each spot corresponding to an active bit of the data pattern.
Abstract: A multi-spot light modulator using a laser diode is disclosed in which a single light pulse from the laser diode generates a multi-spot image of a data pattern, each spot corresponding to an active bit of the data pattern. The ability of a pulsed laser diode to generate a narrow light pulse is used to image an acoustic wave corresponding to the data pattern without the normal degradation in resolution caused by the motion of the acoustic wave.
83 citations
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TL;DR: Thelinearity of the proposed silicon modulator greatly exceeds the linearity of a conventional MZ modulator with ideal, linear phase shifters, which makes it attractive for analog photonic applications.
Abstract: A scheme to achieve a wideband linearized silicon Mach-Zehnder (MZ) modulator is proposed The modulator consists of a single MZ interferometer with identical reverse-biased silicon diode phase shifters in both arms, driven in a push-pull configuration It is shown that the 3rd order nonlinearity of the modulator can be eliminated by canceling the nonlinearities from the silicon phase shifters and the MZ transfer function against each other The 2nd order nonlinearity is simultaneously eliminated by differential detection or operation away from the quadrature point As a result, the linearity of the proposed silicon modulator greatly exceeds the linearity of a conventional MZ modulator with ideal, linear (eg LiNbO3) phase shifters The simplicity and large optical and RF bandwidth of the proposed modulator make it attractive for analog photonic applications
83 citations
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TL;DR: A hybrid silicon nitride and lithium niobate electro-optic Mach-Zehnder modulator that employs 3 dB multimode interference couplers for splitting and combining light is reported that is critical for applications ranging from optical communications to an analog photonic link.
Abstract: A low voltage operation electro-optic modulator is critical for applications ranging from optical communications to an analog photonic link. This paper reports a hybrid silicon nitride and lithium niobate electro-optic Mach–Zehnder modulator that employs 3 dB multimode interference couplers for splitting and combining light. The presented amplitude modulator with an interaction region length of 2.4 cm demonstrates a DC half-wave voltage of only 0.875 V, which corresponds to a modulation efficiency per unit length of 2.11 V cm. The power extinction ratio of the fabricated device is approximately 30 dB, and the on-chip optical loss is about 5.4 dB.
83 citations
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01 Dec 1991
TL;DR: Theoretical predictions and experimental results on two slightly different kinds of linearized optical modulators for use in wideband analog transmission are presented in this paper, where both modulators are based on a cascade coupling of phase-modulated parallel wave guide sections.
Abstract: Theoretical predictions and experimental results on two slightly different kinds of linearized optical modulators for use in wideband analog transmission is presented. Both modulators are based on a cascade coupling of phase-modulated parallel wave guide sections. In both cases, 95 dB suppression of the 3rd harmonic of a single test tone with an optical modulation depth of 20% is theoretically obtained. Some initial experimental results are presented for both modulators.
83 citations