Signal Reconstruction by Phase Retrieval and Optical Backpropagation in Phase-Diverse Photonic Time-Stretch Systems

The signal-to-noise ratio and bandwidth of photonic time-stretch (PTS) systems have previously been limited due to the nonlinear distortion caused by modulator response and dispersive propagation. In this paper, we present a novel method for the reconstruction of the input signal from two phase-dive...

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Bibliographic Details
Published in:Journal of lightwave technology Vol. 25; no. 10; pp. 3017 - 3027
Main Authors: Stigwall, J., Galt, S.
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.10.2007
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Analog-to-digital (A-D) conversion
Applied sciences
Back propagation
Backpropagation
Bandwidth
Circuit properties
Computer simulation
Detection, estimation, filtering, equalization, prediction
Distortion
Distortion measurement
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
fiber optics
Information, signal and communications theory
Integrated optics. Optical fibers and wave guides
Mathematical models
microwave photonics
Modulation
Modulation, demodulation
Modulators
Nonlinear optics
Optical and optoelectronic circuits
Optical distortion
Optical modulation
optical propagation in dispersive media
Optical sensors
optical signal processing
Phase measurement
Phase retrieval
photonic A-D converter
photonic sampling
Photonics
Sampling, quantization
Signal and communications theory
Signal reconstruction
Signal to noise ratio
Signal, noise
Studies
Telecommunications and information theory
time stretch
Integrated optics
Parameter estimation
Phase measurement
Input signal
microwave photonics
Numerical method
Jamming
photonic A-D converter
Backpropagation algorithm
Modulation
Optical method
Signal reconstruction
Sampling
Backpropagation
optical propagation in dispersive media
Modulator
AD conversion
Analog-to-digital (A-D) conversion
photonic sampling
Computational complexity
Intensity measurement
fiber optics
Diversity combining
Phase estimation
Signal processing
Numerical simulation
time stretch
optical signal processing
Reduced order model
Signal distortion
Signal to noise ratio
ISSN:0733-8724, 1558-2213, 1558-2213
Online Access:Get full text
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Description
Summary:The signal-to-noise ratio and bandwidth of photonic time-stretch (PTS) systems have previously been limited due to the nonlinear distortion caused by modulator response and dispersive propagation. In this paper, we present a novel method for the reconstruction of the input signal from two phase-diverse intensity measurements. The method consists of optical phase retrieval at the measurement point followed by simulated optical backpropagation to the modulation point. By numerical simulation of a PTS system with realistic parameters, we analyze the proposed method and compare it with the previously suggested maximum ratio combining (MRC) method. We show that the proposed optical backpropagation method, unlike the MRC method that treats the system as being linear from electrical input to output, can reconstruct the signal even at a large modulation depth and that the method is insensitive to biasing error or drift and not overly sensitive to misestimation of system parameters. Furthermore, to reduce the computational effort associated with the simulation of PTS systems, we present a numerical propagation method whereby the required number of sampling points is reduced by several orders of magnitude.
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ISSN:0733-8724
1558-2213
1558-2213
DOI:10.1109/JLT.2007.905893