Record Details

Photonic time-stretch digitizer and its extension to real-time spectroscopy and imaging

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Photonic time-stretch digitizer and its extension to real-time spectroscopy and imaging
 
Creator FARD, AM
GUPTA, S
JALALI, B
 
Subject Photonic analog-to-digital conversion
time stretch
optical communications
optical links
real-time spectroscopy
optical sampling
optical kerr nonlinearity
high-throughput imaging
TO-DIGITAL CONVERTER
OPTICAL-FIBERS
PARAMETRIC AMPLIFICATION
DISPERSION COMPENSATION
POLYMER MODULATORS
A/D CONVERTERS
CONVERSION
WAVELENGTH
SYSTEMS
RESOLUTION
 
Description Real-time wideband digitizers are the key building block in many systems including oscilloscopes, signal intelligence, electronic warfare, and medical diagnostics systems. Continually extending the bandwidth of digitizers has hence become a central challenge in electronics. Fortunately, it has been shown that photonic pre-processing of wideband signals can boost the performance of electronic digitizers. In this article, the underlying principle of the time-stretch analog-to-digital converter (TSADC) that addresses the demands on resolution, bandwidth, and spectral efficiency is reviewed. In the TSADC, amplified dispersive Fourier transform is used to slow down the analog signal in time and hence to compress its bandwidth. Simultaneous signal amplification during the time-stretch process compensates for parasitic losses leading to high signal-to-noise ratio. This powerful concept transforms the analog signal's time scale such that it matches the slower time scale of the digitizer. A summary of time-stretch technology's extension to high-throughput single-shot spectroscopy, a technique that led to the discovery of optical rouge waves, is also presented. Moreover, its application in high-throughput imaging, which has recently led to identification of rogue cancer cells in blood with record sensitivity, is discussed.
 
Publisher WILEY-V C H VERLAG GMBH
 
Date 2014-10-16T14:09:52Z
2014-10-16T14:09:52Z
2013
 
Type Article
 
Identifier LASER & PHOTONICS REVIEWS, 7(2)207-263
1863-8880
1863-8899
http://dx.doi.org/10.1002/lpor.201200015
http://dspace.library.iitb.ac.in/jspui/handle/100/15748
 
Language en