Optical step frequency reflectometer

Abstract

Articles you may be interested inV -band frequency hopping microwave reflectometer in LHDa) Rev. Sci. Instrum. 79, 10F109 (2008); 10.1063/1.2969036 Frequency hopping millimeter wave reflectometer Rev. Sci. Instrum. 75, 3865 (2004); 10.1063/1.1788834Design and performance of a reflectometer to measure optical properties of multilayer optical thin films AIP Conf.The carrier generated by a solid-state laser can be frequency shifted by a significant amount.This fact was exploited to implement a high-resolution optical-fiber fault locator. A resolution of 4 mm was achieved. Compared to the resolution of a frequency-domain refiectometer that shifts the frequency of the AM modulation of the light, the proposed fault locator has a resolution about 1000 times better. The potential of developing the proposed refiectometer into an ultrahigh-resolution integrated optics fault locator is also discussed.

Finite-Difference Time-Domain Analysis of Wavelength-Selective Characteristics in Weighted Acoustooptic Switches for Wavelength-Division-Multiplexed Photonic Routing

“…These results are also due to the condition number of the matrix A in eq. (2). When the scatters are located at points far away from the antennas, all the antennas see the scatters from similar directions.…”

“…If we combine these results with those obtained using wavelength λ 1 , we also obtain a system of linear equations that can be written as eq. (2). In this case, the coefficient matrix A consists of 2N 2 a rows and N o columns and vector B consists of 2N 2 a components.…”

“…Step frequency techniques have been utilized for one-dimensional measurement such as for locating faults in an optical fiber [1][2][3][4] as well as two-dimensional measurements such as for constructing microwave [5][6][7][8][9][10][11][12][13][14][15][16] or acoustic images. [17][18][19] As seen in these references, multifrequency operation requires a rather complicated mathematical algorithm.…”

Three-dimensional laser microvision

“…Use of discrete Fourier analysis techniques has given rise to the step frequency method. 5,6 The optical coherence-domain reflectometer 7 is another successful device, especially in medical diagnosis. This device is, in principle, a Michelson interferometer with a variable reference path length.…”

<title>Measurement system for scattering medium by synthesis of coherence function with superstructure grating distributed Bragg reflector laser diode</title>

“…24 In the method, however, both the amplitude and the phase in the interferometer output should be detected, and calculation is needed to have the reflectivity distribution. By modulating the optical frequency with stepwise waveform, the technique synthesizes the coherence function into a deltafunction-like peak at an arbitrary location, and thus can detect interferometrically the information at that location, which is adjustable by the modulation parameter or additional phase modulation in the reference wave.…”