Title :
0.04 Hz relative optical-frequency stability in a 1.5 mu m distributed-Bragg-reflector (DBR) laser
Author :
Ishida, Osamu ; Toba, Hiromu ; Tohmori, Yuichi
Author_Institution :
NTT Transmision Syst. Lab., Kanagawa, Japan
Abstract :
The optical frequency of a 1.5- mu m distributed-Bragg-reflector (DBR) laser is stabilized against that of a master laser by heterodyne-type frequency locking with a phase-locked loop (PLL). Despite the laser´s wide linewidth of 16 MHz, stable PLL operation with an optical hold-in range of 26 GHz is realized, and residual frequency fluctuations are reduced to 0.04 Hz at an averaging time of 500 s. The combination of DBR laser and PLL is, therefore, suitable for frequency-controlled light sources. The offset error from the settled frequency caused by the bandlimited beat spectrum is discussed.<>
Keywords :
distributed Bragg reflector lasers; frequency control; laser frequency stability; laser transitions; optical variables control; phase-locked loops; physical instrumentation control; semiconductor junction lasers; 1.5 micron; 500 s; DBR laser; averaging time; bandlimited beat spectrum; distributed-Bragg-reflector laser; frequency fluctuations; frequency-controlled light sources; heterodyne-type frequency locking; master laser; offset error; optical hold-in range; phase-locked loop; relative optical-frequency stability; semiconductor laser diode; settled frequency; wide linewidth; Distributed Bragg reflectors; Frequency; Laser stability; Laser tuning; Optical control; Optical filters; Optical mixing; Optical variables control; Phase locked loops; Voltage-controlled oscillators;
Journal_Title :
Photonics Technology Letters, IEEE
