Real-time spectroscopy with subgigahertz resolution using amplified dispersive Fourier transformation

  title={Real-time spectroscopy with subgigahertz resolution using amplified dispersive Fourier transformation},
  author={Jason T Chou and Daniel Solli and Bahram Jalali},
  journal={Applied Physics Letters},
Dispersive Fourier transformation is a powerful technique in which spectral information is mapped into the time domain using chromatic dispersion. It replaces a spectrometer with an electronic digitizer and enables real-time spectroscopy. The fundamental problem in this technique is the trade-off between the detection sensitivity and spectral resolution, a limitation set by the digitizer’s bandwidth. This predicament is caused by the power loss associated with optical dispersion. We overcome… 

Figures from this paper

Noise figure of amplified dispersive Fourier transformation

Amplified dispersive Fourier transformation (ADFT) is a powerful tool for fast real-time spectroscopy as it overcomes the limitations of traditional optical spectrometers. ADFT maps the spectrum of

Real-time optical reflectometry enabled by amplified dispersive Fourier transformation

The axial scan rate of optical frequency-domain reflectometry and optical coherence tomography can be increased to megahertz frequencies by dispersive Fourier transformation. However, the fundamental

Title Dispersive Fourier transform using few-mode fibers for real-timeand high-speed spectroscopy

Dispersive Fourier Transform (DFT) is a powerful technique for real-time and high-speed spectroscopy. In DFT, the spectral information of an optical pulse is mapped into time using group velocity

Amplified dispersive Fourier-transform imaging for ultrafast displacement sensing and barcode reading

Dispersive Fourier transformation is a powerful technique in which the spectrum of an optical pulse is mapped into a time-domain waveform using chromatic dispersion. It replaces a diffraction grating

Time-Stretch Spectroscopy Based on Laser Cavity Tuning With a Dual-Function Delay Line

Time-stretch spectroscopy has established as a viable technique with high resolution and single-shot capability. However, it generally requires ultra-wideband photodetectors and electronics, and its

Fast Spectrum Measurements Using Optical Computing

Traditional spectrometers are too slow for the continuous real-time measurement of rapidly varying spectrum. Dispersive Fourier transformation (DFT) technology replaces diffraction grating and

Validating data analysis of broadband laser ranging.

This work describes in detail an analysis process for interpreting ranging data when standard telecommunications fiber is used to perform an imperfect dispersive Fourier transform.

Dispersive Fourier Transformation for Versatile Microwave Photonics Applications

Dispersive Fourier transformation (DFT) maps the broadband spectrum of an ultrashort optical pulse into a time stretched waveform with its intensity profile mirroring the spectrum using chromatic

Time-wavelength optical sampling spectroscopy based on dynamic laser cavity tuning

Time-wavelength optical sampling (TWOS) is proposed here as a scheme that leverages the advantages of both wavelength-time mapping and ultrafast optical sampling to achieve real-time spectral

Time-Stretched Femtosecond Lidar Using Microwave Photonic Signal Processing

A real-time lidar with 0.1 mega-hertz update rate and few-micrometer resolution incorporating dispersive Fourier transformation and instantaneous microwave frequency measurement is proposed and demonstrated and turned to microwave photonic signal processing.



Amplified wavelength–time transformation for real-time spectroscopy

Real-time spectroscopy provides invaluable information about the evolution of dynamical processes, especially non-repetitive phenomena. Unfortunately, the continuous acquisition of rapidly varying

High bandwidth absorption spectroscopy with a dispersed supercontinuum source.

An optical gas sensor is presented, making use of a dispersed supercontinuum source, capable of acquiring broad bandwidth spectra at ultrahigh wavelength sweep and repetition rates, and the effect of this averaging on observed precision is investigated.

Wavelength-agile fiber laser using group-velocity dispersion of pulsed super-continua and application to broadband absorption spectroscopy

Abstract.A swept-wavelength source is created by connecting four elements in series: a femtosecond fiber laser at 1.56 μm, a non-linear fiber, a dispersive fiber and a tunable spectral bandpass

Time-domain optical sensing

A chirped optical supercontinuum is used to map absorption spectra into temporal waveforms. Time-domain spectral measurement of acetylene is demonstrated using a modelocked fibre laser as the source

Time magnification of electrical signals using chirped optical pulses

The authors report a method for stretching electrical signals in time. A high chirp rate is imposed on the electrical signal by mixing it with a dispersed ultra-short optical pulse in an

Time-wavelength spectroscopy for chemical sensing

Time-wavelength spectroscopy, using a linearly chirped broad-band pulse, eliminates the need for an optical spectrometer and enables real-time analysis. Utilizing digital filtering and matched

Raman amplifiers for telecommunications

Raman amplifiers are being deployed in almost every new long-haul and ultralong-haul fiber-optic transmission systems, making them one of the first widely commercialized nonlinear optical devices in

Oversampled filter banks

The relations of non-subsampled filter banks to continuous-time filtering are investigated and the design flexibility is illustrated by giving a procedure for designing maximally flat two-channel filter banks that yield highly regular wavelets with a given number of vanishing moments.

Classical Electrodynamics

Electrodynamics of Particles and PlasmasBy P. C. Clemmow and J. P. Dougherty. (Addison-Wesley Series in Advanced Physics.) Pp. ix + 457. (Addison-Wesley London, September 1969.) 163s.