Patent
Electro-optic modulator having gated-dither bias control
David J. Allie,James D. Farina +1 more
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TLDR
In this paper, a closed loop bias control system for maintaining the modulator at its half-power point by modulating a time varying signal on and off at a modulation frequency fm is presented.Abstract:
An electro-optic modulator includes a closed loop bias control system for maintaining the modulator at its half-power point by modulating a time varying signal on and off at a modulation frequency fm. The modulation frequency fm is much lower than the frequency components within the spectrum of the time varying signal, such that, energy within the time varying signal spectrum is recovered at the modulation frequency when the modulator is not operating at the half-power point. A phase sensitive demodulator operating at the modulation frequency fm demodulates a signal indicative of the modulator optical output signal to provide a DC voltage signal value indicative of the half-power point bias error value. The time varying voltage signal may be a dither noise signal or any other time varying signal such as a signal with a single frequency component (e.g. a sine or cosine) or a signal with a plurality of frequency components (e.g., a square wave).read more
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Opto-electronic techniques for reducing phase noise in a carrier signal by carrier suppression
TL;DR: In this article, an opto-electronic unit (110) was used to produce a first electrical signal (121) indicative of a delayed version of the carrier signal and an electrical interferometer (120) received the first electrical signals (121 and a second electrical signal indicative of the second signal to produce two signals which were combined in a mixer (144) to produce an output signal (152) for the oscillator.
Proceedings ArticleDOI
Coupled opto-electronic oscillators
X.S. Yao,Lute Maleki,L. Davis +2 more
TL;DR: In this paper, the authors presented experimental results of coupled optoelectronic oscillators (COEOs) constructed with a semiconductor optical amplifier based ring laser and a SINR colliding pulse mode-locked laser.
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Opto-electronic oscillator having a positive feedback with an open loop gain greater than one
TL;DR: An electro-optical oscillator as mentioned in this paper is an EO modulator having an electrical input port that accepts an electrical control signal and an optical output port, which can be used to generate an optical signal that oscillates at a frequency related to the electrical input signal.
Patent
Brillouin opto-electronic oscillators
TL;DR: Opto-electronic oscillators having at least one Brillouin feedback loop based on the selective sideband amplification to provide a sufficient gain for the oscillator to start and sustain an electro-optic oscillation as discussed by the authors.
Patent
Methods and devices based on brillouin selective sideband amplification
TL;DR: In this paper, the relative frequency separation between the lasers is adjusted to align the frequency of the backscattered Brillouin signal with a desired sideband in the carrier signal to effect a Brillousin gain on the sideband.
References
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Patent
Bias control and method for electro-optic modulators
TL;DR: In this paper, an electro-optical modulation system consisting of an optical modulator, an optical detector, and a bias control circuit was proposed for producing the bias signal as a function of the pulse envelopes.
Patent
Cascaded optic modulator arrangement
TL;DR: In this article, the phase offset of both modulators and the contrast of one modulator are adjusted to minimize both second and third order harmonics inherently generated by the modulation process of each modulator, thereby providing an improved linear response in the output signal of the second modulator.
Patent
Electro-optic system
TL;DR: In this paper, an electro-optic system for mixing and/or transmitting electrical signals using an optical carrier is described, in which the electrical signals are applied to an EO intensity modulator with a nonlinear transfer function, preferably of the Mach-Zehnder interferometric type biased at the transmission null point.
Patent
Electro-optic device
TL;DR: In this paper, the ground plane electrode is arranged to overlie only part of the width of the associated waveguide portion to reduce the temperature sensitivity of the ground-plane electrode.