Title :
Close-in carrier phase noise of laser with coherent feedback
Author :
Tsang-Der Ni ; Xiangdong Zhang ; Daryoush, A.S.
Author_Institution :
Dept. of Electr. & Comput. Eng., Drexel Univ., Philadelphia, PA, USA
Abstract :
The residual phase noise at close-in carrier offset frequency is studied for optical links using a laser diode with an external optical feedback. The external cavity is designed to enhance the fourth harmonic of a reference signal while maintaining a high dynamic range for data signals. FM noise degradation of the modulating signal was measured to be insignificantly higher than intuitively expected 20Log(N). Therefore, the residual phase noise is measured to quantify the noise floor level of the laser diodes.<>
Keywords :
feedback; frequency modulation; laser cavity resonators; optical communication equipment; optical modulation; semiconductor device noise; semiconductor lasers; FM noise degradation; close-in carrier offset frequency; coherent feedback; data signals; external cavity; external optical feedback; fourth harmonic; high dynamic range; laser diode; modulating signal; optical links; residual phase noise; Diode lasers; Dynamic range; Frequency; Laser feedback; Laser noise; Noise measurement; Optical feedback; Optical fiber communication; Phase noise; Signal design;
Conference_Titel :
Microwave Symposium Digest, 1994., IEEE MTT-S International
Conference_Location :
San Diego, CA, USA
Print_ISBN :
0-7803-1778-5
DOI :
10.1109/MWSYM.1994.335361
