Title :
Dynamic linearity improvement of phase and frequency modulated microwave photonic links using optical lattice filter discriminators
Author :
Wyrwas, J.M. ; Rasras, M.S. ; Chen, Y.K. ; Cappuzzo, M.A. ; Chen, E.Y. ; Gomez, L.T. ; Klemens, F. ; Keller, R. ; Earnshaw, M.P. ; Padro, F. ; Bolle, C. ; Peach, R. ; Middleton, C. ; DeSalvo, R. ; Wu, M.C.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of California, Berkeley, CA, USA
Abstract :
A phase modulated (PM) microwave photonic link (MPL) with linearity improvement is presented. The link demodulates the PM using a phase discriminator based on a dynamically tunable, integrated, sixth-order optical lattice filter in planar lightwave circuit (PLC) technology. The linearity of the demodulation process is optimized by using electrical spectrum monitoring and a feedback algorithm to automatically choose the filter coefficients. For a 2 GHz modulation frequency, the link achieves a 6.7 dB improvement in the third-order output intercept point (OIP3) for intermodulation distortion (IMD) over a Mach-Zehnder interferometer (MZI).
Keywords :
frequency modulation; microwave links; optical communication; optical filters; optical lattices; optical links; optical modulation; phase modulation; Mach Zehnder interferometer; dynamic linearity improvement; frequency modulated microwave photonic links; intermodulation distortion; optical lattice filter discriminators; phase modulated microwave photonic link; Finite impulse response filter; Frequency modulation; Microwave filters; Optical fiber filters; Power harmonic filters; Analog photonics; RF photonics; microwave photonic filter; microwave photonics; radio-over-fiber (RoF);
Conference_Titel :
Microwave Photonics, 2011 International Topical Meeting on & Microwave Photonics Conference, 2011 Asia-Pacific, MWP/APMP
Conference_Location :
Singapore
Print_ISBN :
978-1-61284-716-0
DOI :
10.1109/MWP.2011.6088664
