Title :
Two-Wavelength Square-Waveform Generation Based on Fiber Optical Parametric Oscillator
Author :
Yang, Sigang ; Zhang, Chi ; Zhou, Yue ; Wong, Kenneth Kin-Yip
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Hong Kong, Hong Kong, China
Abstract :
A square-waveform generator based on a fiber optical parametric oscillator (FOPO) is proposed and demonstrated experimentally. The FOPO works fundamentally by extracting the longitudinal modes beating signal to drive the intracavity amplitude modulator. In order to broaden the longitudinal mode spacing, two sub-ring cavities with a short cavity length are used. The longitudinal modes are phase locked, which ensures the generated microwave signal with very low phase noise. By biasing the amplitude modulator, the even-order beating signals are suppressed, while the odd-order beating signals are enhanced. Thus, the FOPO is self-starting and can provide stable square-waveform output with the repetition rate of 1.133 GHz at the signal and idler simultaneously. It is tunable over 10 nm, which is only limited by the gain bandwidth of the fiber optical parametric amplifier of the current configuration.
Keywords :
amplitude modulation; laser cavity resonators; laser mode locking; microwave photonics; optical fibre amplifiers; optical modulation; optical parametric amplifiers; optical parametric oscillators; signal generators; square-wave generators; even-order beating signals; fiber optical parametric amplifier; fiber optical parametric oscillator; frequency 1.133 GHz; gain bandwidth; intracavity amplitude modulator; longitudinal mode spacing; longitudinal modes; odd-order beating signals; phase locking; sub-ring cavities; two-wavelength square-waveform generation; very low phase noise; Cavity resonators; Fiber optics; Laser mode locking; Masers; Microwave oscillators; Modulation; Nonlinear optics; Microwave photonics; nonlinear optics; optical fiber lasers; optical generation of microwave signal; parametric amplifiers (AMPs); parametric oscillators;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2010.2074610