Title :
Effect of laser and RF oscillator phase noises
Author :
Cho, Tae-Sik ; Yun, Changho ; Kim, Kanghee ; Kim, Kiseon
Author_Institution :
Dept. of Inf. & Commun., K-JIST, Kwangju, South Korea
Abstract :
The effect of phase noises from a laser and an oscillator on radio over fiber (RoF) systems is analyzed and discussed with a power spectral density (PSD) function. It is shown that the carrier to noise ratio (CNR) penalty is deeply related to the bandwidth of a electrical filter at a receiver and the phase noise from a radio frequency (RF) signal oscillator rather than that from a laser with a small differential delay and a direct detection scheme. The CNR penalties due to the laser linewidths of 10 MHz and 624 MHz are 0.045 dB and 2.78 dB, while the increase of the RF oscillator linewidth from 1 Hz to 10 Hz results in about 10 dB penalty at 50 GHz, 24 km transmission in a standard single mode fiber (SSMF) with a fiber chromatic dispersion of 17 ps/km nm.
Keywords :
circuit noise; laser noise; optical fibre communication; phase noise; radiocommunication; radiofrequency oscillators; spectral-domain analysis; 1 to 10 Hz; 10 MHz; 50 GHz; 624 MHz; CNR penalty; RF oscillator phase noises; carrier to noise ratio; differential delay; direct detection scheme; electrical filter bandwidth; fiber chromatic dispersion; laser phase noise; phase noise effects; power spectral density function; radio frequency signal oscillator; radio over fiber systems; receiver; standard single mode fiber; Bandwidth; Fiber lasers; Filters; Laser noise; Oscillators; Phase noise; Power lasers; Radio frequency; Receivers; Signal to noise ratio;
Conference_Titel :
Microwave Symposium Digest, 2004 IEEE MTT-S International
Print_ISBN :
0-7803-8331-1
DOI :
10.1109/MWSYM.2004.1335913
