Title :
Optical Microwave Frequency Up-Conversion Via a Frequency-Doubling Optoelectronic Oscillator
Author :
Shin, Myunghun ; Kumar, Prem
Author_Institution :
Northwestern Univ., Evanston
Abstract :
We propose and demonstrate an optical microwave modulator that incorporates a low phase-noise optoelectronic oscillator (OEO) for frequency up-conversion in a radio-over-fiber system. A single Mach-Zehnder lithium-niobate waveguide modulator working as a local oscillator in a frequency-doubling OEO directly up-converts the baseband signals to a carrier band. We demonstrate frequency up-conversion to the 20-GHz band for optical analog signals in the intermediate-frequency (IF) band and for optical digital signals at 1.25 Gb/s. The measured transmission bandwidth for IF modulated signals is greater than 1.5 GHz for transmission over 50.5 km of single-mode fiber.
Keywords :
electro-optical modulation; microwave photonics; optical frequency conversion; optical waveguides; optoelectronic devices; radio-over-fibre; Mach-Zehnder waveguide modulator; bit rate 1.25 Gbit/s; frequency 20 GHz; frequency-doubling optoelectronic oscillator; local oscillator; optical microwave frequency up-conversion; optical microwave modulator; radio-over-fiber system; size 50.5 km; Integrated optics; Local oscillators; Microwave frequencies; Microwave oscillators; Optical fiber networks; Optical modulation; Optical network units; Optical noise; Optical transmitters; Phase noise; All-optical up-conversion; optical carrier suppression modulation; optical microwave (MW) generation; optoelectronic oscillator (OEO); radio-over-fiber (ROF);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.905669
