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Optical encoder devices and systems

Brandon Buckley

Published Jan 23, 2023• 0 citations
OpenAlex

Abstract

Devices, systems and methods for encoding information using optical components are described. Information associated with a first optical signal (e.g., an optical pump) is encoded onto the phase of a second optical signal (e.g., an optical probe) using cross phase modulation (XPM) in a non-linear optical medium. The optical signals are multiplexed together into the nonlinear optical medium. The probe experiences a modified index of refraction as it propagates through the medium and thus accumulates a phase change proportional to the intensity of the pump. The disclosed devices can be incorporated into larger components and systems for various applications such as scientific diagnostics, radar, remote sensing, wireless communications, and quantum computing that can benefit from encoding and generation of low noise, high resolution signals. Examples of the encoded information includes intrinsic noise from the optical source, or others signals of interest, such as electrical, optical, X-ray, or high-energy particle signals.

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Devices, systems and methods for encoding information using optical components are described. Information associated with a first optical signal (e.g., an optical pump) is encoded onto the phase of a second optical signal (e.g., an optical probe) using cross phase modulation (XPM) in a non-linear optical medium. The optical signals are multiplexed together into the nonlinear optical medium. The probe experiences a modified index of refraction as it propagates through the medium and thus accumulates a phase change proportional to the intensity of the pump. The disclosed devices can be incorporated into larger components and systems for various applications such as scientific diagnostics, radar, remote sensing, wireless communications, and quantum computing that can benefit from encoding and generation of low noise, high resolution signals. Examples of the encoded information includes intrinsic noise from the optical source, or others signals of interest, such as electrical, optical, X-ray, or high-energy particle signals.
Nonlinear interferometers include a nonlinear optical medium that is situated to produce a conjugate optical beam in response to a pump beam and a probe beam. The pump, probe, and conjugate beams propagate displaced from each other along a common optical path. One of the beams is selectively phase shifted, and the beams are then returned to the nonlinear medium, with the selectively phase shift beam phase shifted again. The nonlinear medium provides phase sensitive gain to at least one of the probe or conjugate beams, and the amplified beam is detected to provide an estimate of the phase shift.
High-dimensional all-optical information transfer facilitates large-capacity, high-speed, and energy-efficient optical communication, playing a pivotal role in advancing modern photonic technologies. Here, we demonstrate the all-optical transfer of structured information between two beams with different frequencies via spatial cross-phase modulation in a hot 85Rb vapor. A high-power pump beam, characterized by a structured light, induces a refractive index change in the rubidium vapor. A low-power, initially Gaussian probe beam counter-propagates through the rubidium vapor cell, undergoing a nonlinear phase shift induced by the pump beam. This enables the transfer of the spatial characteristics imprinted by the pump beam onto the probe beam with maximum structural integrity and similarity. The spatial evolution of the transverse intensity of the probe beam vs frequency detunings of the pump and probe beams, pump beam power, and cell temperature is studied. We have further shown that the structural similarity can be manipulated by changing the pump beam power and temperature of the vapor cell. Our findings may reveal a way to manipulate light fields, offering potential applications in optical communication, all-optical data processing, and advanced photonic devices.
An Optical Information Transfer Enhancer System includes a first system for producing an information bearing first optical wave that is impressed with a first information having a first information strength wherein the first optical wave has a first shape. A second system produces a second optical wave. An information strength enhancer module receives the first and said second optical waves and impresses the first optical wave upon the second optical wave via cross-phase modulation (XPM) to produce an information-strength-enhanced second optical wave having a second information strength that is greater than the first information strength of the first optical wave. Following a center-wavelength changer by an Optical Information Transfer Enhancer System improves its performance.
The transmission of optical signals under the effects of cross-phase modulation (XPM) and self-phase modulation (SPM) together in pump-probe wave structure is investigated in intensity modulation-direct detection wavelength division multiplexing (IM-DD WDM) systems. A simple expression for frequency domain IM of probe channel is derived. The analytical method to determine the temporal shape of probe wave when arbitrary wave is inputted in pump channel is confirmed. The impact of channel separation and transmission rate to XPM is assessed. We find that the SPM in pump channel increase temporal intensity modulation index reflected XPM to a certain extent. The analytical result agrees well with numerical simulation.
This thesis is divided into two portions. The first part explores the cross-interaction of two counter-propagating plane waves in a Kerr-like medium. It is shown analytically and numerically that due to cross-induced anisotropy, the "input-output" characteristics of such a system have not only multivalued hysteretic response but also multiple isolated branches (the so called isolas). We demonstrate also that the system may exhibit dispersion-related temporal instability above certain threshold intensity of pumping waves. Most of these effects may find applications in optical bistable and switching devices and optical signal processing. In the second part, the generation of x-ray transition radiation by low energy electron beams traversing a periodic solid-state layered medium is considered. We investigate the influence of photoabsorption and electron scattering on the phenomenon and develop a optimization procedure for selecting parameters of the system to maximize the radiation. We show that a combination of materials with high and low atomic numbers can produce an intense x-ray radiation with very narrow spectral peaks at the vicinity of K, L, …\dots… atomic absorption edges of each of the materials. Our results demonstrate that the proposed inexpensive x-ray source with relatively low electron beam energy can be used to generate narrow-line x-ray radiation.
Quantum optical device authentication technologies are described herein. A first device includes an optical transmitter transmits a plurality of pulses to an optical receiver included on a second device. The optical pulses each have one of two non-orthogonal optical states. The optical receiver measures each of the pulses and the second device records a measured value of the optical state of each pulse. Subsequently, the second device transmits the measured values of the optical states of the pulses to the first device. The first device outputs an indication of whether the second device is authenticated based upon the measured values received from the second device and the optical states of the pulses transmitted by the optical transmitter.