Title :
Optical-frequency encoder using polarization-maintaining fibre
Author :
Kobayashi, Masaru ; Takada, Kasumasa ; Noda, Juichi
Author_Institution :
NTT Opto-electron. Lab., Ibaraki, Japan
fDate :
11/1/1990 12:00:00 AM
Abstract :
A new method for monitoring the frequency modulation of coherent laser light is presented. The measurement system is an optical-frequency encoder which utilizes multireflection in a short polarization-maintaining fiber. The multireflection in each orthogonal polarization mode of the fiber produces beat signals by sweeping the optical frequency. The resultant two beat signals are monitored as an increase or decrease in optical frequency by holding the two signals in phase quadrature. The experimental setup, the principle for obtaining quadrature signals, and the results of monitoring distributed-feedback laser-diode frequency modulation are presented
Keywords :
encoding; fibre optics; frequency modulation; light polarisation; optical communication equipment; optical modulation; beat signals; coherent laser light; distributed-feedback laser-diode frequency modulation; frequency modulation; measurement system; multireflection; optical frequency; optical-frequency encoder; orthogonal polarization mode; phase quadrature; polarization-maintaining fibre; quadrature signals; Circuit faults; Diode lasers; Fiber lasers; Frequency measurement; Frequency modulation; Monitoring; Optical crosstalk; Optical fiber polarization; Optical modulation; Optical scattering;
Journal_Title :
Lightwave Technology, Journal of
