Session: TUPF | Microwave Photonics and Low Noise Receivers |
Chair: | Bill Jemison, Lafayette College |
Abstract: | This session presents recent results in microwave photonics including discussions of phase noise, frequency measurements, and tunable oscillators. |
| | TUPF-1 | Microwave Photonic Instantaneous Frequency Measurement with Simultaneous Parallel Operation within a Single Optical Fiber |
3:00 PM-5:00 PM | N. Sarkhosh, H. Emami, L. Bui, A. Mitchell, School of Electrical and Computer Engineering, GPO Box 2476, Australia |
(1250) | A Microwave photonic system which simultaneously implements multiple parallel IFMs within a single optical fiber is proposed and practically demonstrated. Three optical carriers of different wavelength are modulated by the same RF signal and then differentially delayed. All three carriers are then mixed in a highly nonlinear optical fiber. The mixing products are separated and the optical power of each can be related to the input RF frequency. We demonstrate simultaneous acquisition of two distinct frequency measurement responses over the range from 2-40GHz. This system is all-optical and requires no high-speed electronic components. Avenues for extending the number of simultaneous channels are identified. |
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TUPF-2 | Optimization of Phase Noise in an All-optical Frequency Upconverter Utilizing an Optical Interleaver and a Semiconductor Optical Amplifier for Radio-over-Fiber Applications |
3:00 PM-5:00 PM | H. Kim, J. Song, Gwangju Institute of Science and Technology (GIST), Gwangju, Republic of Korea |
(1344) | An all-optical frequency upconverter using an optical interleaver and a semiconductor optical amplifier (SOA) has been experimentally demonstrated for radio-over-fiber (RoF) applications. An optical radio frequency (RF) signal (ƒRF=25 GHz) consisting of an optical carrier and a sideband is generated by mixing an optical intermediate frequency (IF) signal (ƒIF=1 GHz) with an optical local oscillator (LO) signal (ƒLO=24 GHz). The phase noise characteristic of the all-optical frequency upconverter is limited by that of the LO signal source. However, it is degraded due to path imbalance of two optical signal paths, which can be compensated by the use of a delay line. Compensation of the path imbalance by an optimum delay line produces an optimized phase noise of the upconverted RF signal of approximately -98 dBc/Hz at the offset frequency of 10 kHz. |
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TUPF-3 | Dynamics of the Optical Frequency Locked Loop using tunable Nd: YVO4 microchip lasers |
3:00 PM-5:00 PM | M. Alemohammad1, Y. Li2, P. R. Herczfeld1, 1Drexel University, Philadelphia, United States, 2UMass Dartmouth, North Dartmouth, United States |
(1732) | This paper concerns the dynamics of a rapidly tunable optical frequency locked loop (OFLL). The optical domain generation of high fidelity microwave signals has been subject of numerous articles in recent years. Of particular interest is the use of single or double optical frequency locked loops, which reduce the phase noise. In many applications it is desirable to rapidly tune or even hop the frequency while still maintaining low phase noise. In this report we examine the dynamics of the OFLL and show that tuning speeds in the order of few μsec are attainable. |
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TUPF-4 | A 18.85 mW 20-29 GHz Wideband CMOS LNA with 3.85±0.25 dB NF and 18.1±1.9 dB Gain |
3:00 PM-5:00 PM | Y. Chiu, Y. Lin, J. Chang, National Chi Nan University, Puli, Taiwan |
(1499) | A 20-29 GHz wideband CMOS low-noise amplifier (LNA) with flat and low noise figure (NF), flat and high gain (S21), and excellent phase linearity property (group-delay-variation is only ±22.6 ps across the whole band) is demonstrated. To achieve flat and low NF, the size, layout and bias of the input transistor were first optimized for minimum NF, and then the inductance of the input inductors was tuned to obtain a slightly under-damped (flat) NF frequency response. In addition, to achieve flat and high S21 and small group-delay-variation, the inductive-peaking technique was adopted in the current-reused stage for bandwidth enhancement. The LNA consumed 18.85 mW power and achieved flat and low NF of 3.85±0.25 dB, and flat and high S21 of 18.1±1.9 dB over the 20-29 GHz band of interest. These are the best NF and S21 performances ever reported for a 21.65-26.65 GHz or a 22-29 GHz wideband CMOS LNA. |
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TUPF-5 | Differential Noise Figure Measurement: A Matrix Based Approach |
3:00 PM-5:00 PM | M. Robens, R. Wunderlich, S. Heinen, RWTH Aachen University, Aachen, Germany |
(1605) | In this paper, a new matrix-based approach for differential noise figure measurement will be presented. Passive components used for embedding a differential device into a single ended test setup are characterized by their noise correlation matrices. Then, signal transfer via the component chain is described by chain matrices. Determining the output referred noise correlation matrix of the device under test this way, a noise figure can be denoted. |
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