All-optical RF filter using amplitude inversion in a semiconductor optical amplifier (original) (raw)
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Photonic delay lines (PDLs) are a powerful and important technology for microwave photonics applications and in particular for the implementation of wideband phased array antenna controllers since they solve many of the limitations of electronic controllers, such as large instantaneous bandwidth and tunable signal processing bandwidth. They also offer immunity to electromagnetic interference and electromagnetic pulses. Two of the most critical properties of PDL for advanced phased array antenna control are the fast switching speed and the accurate control of the time delays. In this paper, we propose a novel combined use of semiconductor optical amplifier (SOA) and Optiflex TM fiber circuit technology for the implementation of PDL architectures. Both technologies are currently quite mature and advanced. SOA technology has been used extensively on optical networks. On the other hand, Optiflex technology has been invented and used for optical backplanes and interconnects. In these PDL architectures, the SOAs act both as ultra-fast switching optical elements and as insertion loss compensators. On the other hand, accurate control of the time delays is achieved through the proper design of OptiFlex circuits. The integration of SOA and OptiFlex to build novel photonic delay line architectures provides small size, low power consumption, and ease in assembly, offering at the same time very good RF performance.
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Microwave and Optical Technology Letters, 2010
at 3.8 GHz is clearly observed, which gives about À33 dB rejection. At the rejection band of 2.3-12 GHz, the rejection of the transmission is less than about À20 dB. In Figure 5, the simulated result is in well agreement with the measured result. In Figure 6, the measured result of the proposed LPF provides better rejection characteristics than that of the conventional one whose size is 38.3 Â 25 mm 2. 4. CONCLUSIONS A compact LPF for wideband rejection is discussed and its brief design procedure is also described. DSISS and BDGS may yield slow wave effect, which can be resulted in small circuit size, sharp cutoff, and wide band rejection characteristics compared with the conventional LPF using SISS and CDGS. The size reduction of the proposed LPFs is about 23% compared with the conventional LPF. The proposed LPF is obtained in wideband rejection that is below À20 dB from 2.3 to 12 GHz.
Future Trends in Microelectronics, 1996
We propose a novel all-optical structure of phase lock loop for locking two semiconductor lasers with a stable microwave offset for use in phased-array antenna systems. 1. Motivation Optical control of millimeter wave antenna arrays is an important technological challenge. This goal requires several key elements, currently under intense development worldwide. One of these elements is a dual optical beam source capable of producing a stable millimeter wave beat frequency when mixed at an antenna site. Such a source is important in the implementation of virtually any architecture for optical distribution of microwave phase between antenna array oscillators.