Title :
Small-frequency-difference stabilization of laser diodes using /sup 12/C/sub 2/H/sub 2/ and /sup 13/C/sub 2/H/sub 2/ absorption lines for transmitter and local oscillator of optical heterodyne systems
Author :
Sakai, Yoshihisa ; Kano, Fumiyoshi ; Sudo, Shoichi
Author_Institution :
NTT Opto-Electron. Lab., Kanagawa, Japan
Abstract :
Small-frequency-difference stabilization of distributed Bragg reflector (DBR) laser diodes has been demonstrated for the first time by using vibrational-rotational absorption of /sup 12/C/sub 2/H/sub 2/ and /sup 13/C/sub 2/H/sub 2/ molecules. Frequency stabilization of two DBR laser diodes has been carried out at a wavelength of about 1.536 mu m. The frequency difference between the two stabilized lasers was evaluated to be 9 GHz by the beat spectrum measurement. The experimental results suggest that such a pair of frequency-stabilized laser diodes with a small frequency difference could be used as the transmitter and local oscillator of optical heterodyne systems.<>
Keywords :
demodulation; distributed Bragg reflector lasers; infrared spectra of organic molecules and substances; laser frequency stability; molecular rotation-vibration; optical communication equipment; organic compounds; semiconductor junction lasers; 1.536 micron; absorption lines; acetylene-/sup 12/C molecules; acetylene-/sup 13/C molecules; beat spectrum measurement; distributed Bragg reflector laser diodes; local oscillator; optical heterodyne systems; small frequency difference stabilization; transmitter; vibrational-rotational absorption; Absorption; Diode lasers; Frequency shift keying; Laser stability; Local oscillators; Optical feedback; Optical mixing; Optical receivers; Optical sensors; Optical transmitters;
Journal_Title :
Photonics Technology Letters, IEEE
