Title :
High Dynamic Range Microwave Photonic Links for RF Signal Transport and RF-IF Conversion
Author :
Karim, Adil ; Devenport, Jason
Author_Institution :
L-3 PHOTONICS, Carlsbad, CA
Abstract :
Two different techniques were used to extend the dynamic range of analog optical links operating at microwave frequencies. The link noise figure was reduced by adjusting the bias point of an external Mach-Zehnder intensity modulator. The link distortion was reduced by linearizing the transfer function of the intensity modulator. Frequency conversion was implemented using an additional optical modulator and electrical local oscillator rather than a conventional electronic mixer. A microwave frequency signal transport link was demonstrated with a spur-free dynamic range (SFDR) of 71 dB in a 500-MHz noise bandwidth. A link with down-conversion from a microwave frequency to an intermediate frequency was demonstrated with an SFDR of 64 dB in a 500-MHz noise bandwidth.
Keywords :
Mach-Zehnder interferometers; microwave photonics; optical communication; optical frequency conversion; optical links; optical noise; optical transfer function; analog optical links; conventional electronic mixer; down-conversion; electrical local oscillator; external Mach-Zehnder intensity modulator; frequency 500 MHz; intensity modulator; intermediate frequency; link noise figure; microwave frequency; microwave frequency signal transport link; optical modulator; spur-free dynamic range; transfer function; Bandwidth; Dynamic range; Frequency conversion; Intensity modulation; Microwave frequencies; Noise figure; Optical distortion; Optical fiber communication; Optical modulation; Optical noise; Analog systems; electro-optic modulation; microwave photonics; modulation; noise; optical fiber communication; optoelectronic devices;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2008.927603
