Title :
Delayed-self-heterodyne measurement of laser frequency fluctuations
Author_Institution :
NTT Transmission Syst. Lab., Kanagawa, Japan
fDate :
11/1/1991 12:00:00 AM
Abstract :
The two-sample (or Allan) variance of frequency fluctuations was used for laser frequency-noise characterization at Fourier frequencies below 1 MHz. The delayed self-heterodyne technique was used for the variance measurement. Analytical calculations ensure that just twice the variance values were observed at τ<0.3τd, where τ is the averaging time for the frequency measurement and τd is the delay time. The variance measurements of 1.5-μm distributed Bragg reflector and distributed feedback laser diodes were demonstrated at 6.0×10-7⩽τ⩽1.0×10-4 [s] by using an 81.5-km fiber delay line. Observed flicker fluctuations (or 1/ f noise) are discussed
Keywords :
distributed Bragg reflector lasers; distributed feedback lasers; electron device noise; laser frequency stability; laser variables measurement; noise measurement; random noise; semiconductor junction lasers; 1.5 micron; 1/f noise; 81.5 km; Allan variance; DBR LD; Fourier frequencies; averaging time; delay time; delayed self heterodyne measurement; distributed feedback laser diodes; fiber delay line; flicker fluctuations; frequency stability; laser frequency fluctuations; laser frequency-noise characterization; semiconductor lasers; two sample variance; Delay; Fluctuations; Frequency estimation; Frequency measurement; Laser feedback; Laser noise; Noise measurement; Power lasers; Semiconductor device noise; Semiconductor lasers;
Journal_Title :
Lightwave Technology, Journal of
