Title :
Double-Ring Resonance-Enhanced Linear Photonic Frequency Discriminator for Microwave-Photonic Links
Author :
Jaehyun Kim ; Madsen, C.K.
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
The design of a photonic frequency discriminator with enhanced linearity is proposed and analyzed. The discriminator consists of a Mach-Zehnder Interferometer and two ring resonators which linearize the magnitude and phase response, respectively. The discriminator is flexible as it can be switched between linear-intensity and linear-field regimes. The linearity of the discriminator is demonstrated by simulating the third-order intermodulation distortion (IMD3) and corresponding third-order output intercept point (OIP3). Simulation results show that the linearity of the phase response plays a critical role in suppressing IMD3 and resonance-enhanced IMD3 suppression by the double-ring structure is observed. Corresponding OIP3 even exceeds that of a perfect linear intensity discriminator.
Keywords :
Mach-Zehnder interferometers; discriminators; intermodulation distortion; microwave photonics; optical communication equipment; optical design techniques; optical links; optical resonators; Mach-Zehnder interferometer; OIP3; double-ring resonance-enhanced linear photonic frequency discriminator; linear intensity discriminator; linear-field; magnitude response; microwave-photonic links; phase response; resonance-enhanced IMD3 suppression; ring resonators; third-order intermodulation distortion; third-order output intercept point; Frequency modulation; Optical fibers; Optical filters; Optical ring resonators; Photonics; Resonant frequency; Microwave photonics; RF-photonics; optical filter; optical frequency modulation; optical phase modulation; optical ring resonator; optical waveguide; photonic frequency discriminator;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2013.2290123
