Title :
Improved radio over fiber performance using predistortion linearization
Author :
Katz, A. ; Jemison, W. ; Kubak, M. ; Dragone, J.
Author_Institution :
Coll. of New Jersey, Ewing, NJ, USA
Abstract :
This paper describes improvements to Radio Over Fiber photonic links obtained by increasing the linearity of Mach Zehnder modulators using predistortion. The work was conducted at the Ku and X-band satellite uplink frequencies with a 1550 nm laser, but should be applicable to any microwave or even millimeter frequency band and any externally modulated laser. Link performance was evaluated for 2-tone intermodulation distortion, noise power ratio (NPR) and WCDMA adjacent channel power. Intermodulation distortion was reduced by more than 15 dB, and more than a 6 dB increase in effective signal power was demonstrated for typical system requirements.
Keywords :
Mach-Zehnder interferometers; code division multiple access; intermodulation distortion; linearisation techniques; microwave links; microwave photonics; optical fibre communication; satellite links; 1550 nm; Ku-band; Mach-Zehnder modulator; WCDMA adjacent channel power; X-band; effective signal power; externally modulated laser; microwave link; noise power ratio; predistortion linearization; radio-over-fiber photonic link; satellite uplink; two-tone intermodulation distortion; Fiber lasers; Frequency; Intermodulation distortion; Laser noise; Linearity; Masers; Optical modulation; Predistortion; Satellite broadcasting; Signal to noise ratio;
Conference_Titel :
Microwave Symposium Digest, 2003 IEEE MTT-S International
Conference_Location :
Philadelphia, PA, USA
Print_ISBN :
0-7803-7695-1
DOI :
10.1109/MWSYM.2003.1212634
