2010 IEEE MTT-S International Microwave Symposium Technical Program

Session: WE3C	Microwave Photonic Technologies
Chair:	Adil Karim, JHU/APL
Co-Chair:	Ron Reano, Ohio State University
Abstract:	This session presents state-of-the-art results in microwave photonic devices, subsystems, and systems including oscillators, modulators, receivers, and links.

WE3C-1	Highly Linear InP Phase Modulator for High Dynamic Range RF/Photonic Links
1:20 PM-1:40 PM	R. Wang¹, A. Bhardwaj², S. Ristic², L. Coldren², J. Bowers², P. Herczfeld³, Y. Li¹, ¹University of Massachusetts Dartmouth, North Dartmouth, United States, ²University of California, Santa Barbara, Santa Barbara, United States, ³Drexel University, Philadelphia, United States
(1693)	Abstract — The optical phase locked loop (OPLL) photonic integrated circuit (PIC) is a key element for the emerging linear coherent RF-photonic links. One of the main challenges for the OPLL-PIC is the nonlinearity of the Indium Phosphide (InP)-based phase modulator. In this paper, we report the experimental results from a multi-quantum well phase modulator fabricated on an InP substrate that is specially designed for the OPLL-PIC. The phase modulator shows low optical loss and good linearity performance. In particular, at a reverse bias voltage of 5.6 V, its phase IP3 and insertion loss per unit length are ~2.8π/mm and 1.2 dB/mm, respectively.

WE3C-2	A New Optoelectronic Oscillator Topology Based on a Class E Analog Fiber Optic Link
1:40 PM-2:00 PM	W. D. Jemison¹, T. A. Wey¹, A. Paolella², ¹Lafayette College, Easton, United States, ²Artisan Laboratories, Inc., Jamison, United States
(1591)	A new optoelectronic oscillator (OEO) topology based on a class E analog fiber optic link is presented. This topology provides a high level of inherent opto-electronic conversion gain in the analog fiber optic link portion of the OEO thus eliminating the need for dedicated post-detector gain. The class E operation also allows for dual loop operation using a single optical detector and can provide good dc-RF efficiency. A proof-of-concept dual loop OEO was designed at 77 MHz and experimental results are reported that validate the proposed topology.

WE3C-3	Front-End Design of W-band Integrated Photonic Transmitter with Wide Optical-to-Electrical Bandwidth for Wireless-Over-Fiber Applications
2:00 PM-2:20 PM	H. Tsai¹, N. Chen², F. Kuo¹, J. Shi¹, ¹National Central University, Jhongli, Taiwan, ²Yuan Ze University, Chung-Li, Taiwan
(1442)	A broadband, integrated photonic transmitter front-end is demonstrated. The front-end essentially comprises a dipole-based structure fed horn antenna and a broadband slotline to coplanar-waveguide transition. The proposed dipole-based antenna feeding structure does not call for any modifications on the waveguide and bond wires on the structure for insertion loss reduction, which is critical for an easy and low-cost transmitter implementation in the milliliter-wave regime. For experimental demonstration, the proposed front-end is integrated with a near-ballistic uni-travelling-carrier photodiode (NBUTC-PD) through flip-chip bonding for realization of a W-band integrated photonic transmitter poised for high-speed wireless data transmission. Owing to wide optical-to-electrical bandwidth of the NBUTC-PD integrated with the proposed front-end, the demonstrated photonic transmitter is of a high data rate up to 12.5 Gb/s and expected to find applications in the wireless-over-fiber systems.

WE3C-4	Whispering-gallery mode based photonic RF receiver
2:20 PM-2:40 PM	V. Ilchenko, J. Byrd, A. Savchenkov, P. Koonath, A. Matsko, D. Seidel, L. Maleki, OEwaves Inc., Pasadena, United States
(1114)	We describe our recent achievements in integration of narrowband photonic RF receivers and discuss ultimate parameters of the devices. The best sensitivity and the spurious free dynamic range achieved in current built of our coherent receiver approaches -145 dBm/Hz and 90 dB/Hz^(2/3) respectively. We plan to improve these values to -164 dBm/Hz and 105 dB/Hz^(2/3) in the next generation, while keeping the 13.5x8.5x4.7 mm form factor intact.

WE3C-5	Experimental Demonstration of a Downlink Multi-Channel Hybrid Fiber-Radio using Digitized RF-over-Fiber Technique
2:40 PM-3:00 PM	Y. Yang, C. Lim, A. Nirmalathas, the University of Melbourne, Melbourne, Australia
(1043)	We propose an efficient transmission scheme for Hybrid Fiber-Radio (HFR) system using a digitized RF-over-fiber (DRoF) technique, which can simplify frequency translation functions and supports multiple wireless services. We experimentally demonstrate a DRoF-HFR downlink for the transmission of GSM, UMTS and WiMAX services, with a minimum sampling rate of 50 MHz and an overall optical data rate of 400 Mb/s. Experimental results show that the amount of amplification required for the image at the desired wireless carrier frequency becomes significant when the image resides in the 20th or higher order Nyquist zone.

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