Title :
Resolution controllable optical time domain reflectometry based on low coherence interference
Author :
Takada, Kazumasa ; Himeno, Akira ; Yukimatsu, Ken-ichi
Author_Institution :
NTT Corp., Tokyo, Japan
fDate :
11/1/1991 12:00:00 AM
Abstract :
A low-coherence optical time domain reflectometer (OTDR) that can control spatial resolution is proposed to efficiently diagnose waveguides. This is achieved using a light source consisting of a superluminescent diode (SLD), an optical bandpass filter for truncating the SLD output, and an antireflection-coated laser diode booster amplifier. Two resolutions, 44 and 14 μm, were experimentally demonstrated with and without the filter having a 2.7-nm full width at half maximum (FWHM), respectively. The length of the blind space and the minimum detectable reflectivity were respectively <7 mm and <-134 dB at a 3-Hz detection bandwidth, for both resolutions. The noise characteristics of the light source and the system performance are investigated theoretically and experimentally
Keywords :
band-pass filters; light emitting diodes; optical fibres; optical filters; optical waveguides; time-domain reflectometry; 3 Hz; antireflection-coated laser diode booster amplifier; blind space; detection bandwidth; light source; low coherence interference; low-coherence optical time domain reflectometer; minimum detectable reflectivity; noise characteristics; optical bandpass filter; optical fibres; resolution controllable OTDR; spatial resolution; superluminescent diode; Band pass filters; Diode lasers; Light sources; Optical control; Optical filters; Optical waveguides; Reflectometry; Spatial resolution; Stimulated emission; Superluminescent diodes;
Journal_Title :
Lightwave Technology, Journal of
