| 1. |
- Stigwall, Johan, 1977, et al.
(författare)
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Non-linear Signal Retrieval in Wide-Band Photonic Time-Stretch Systems Using the Gerchberg-Saxton Algorithm
- 2006
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Ingår i: International Topical Meeting on Microwave Photonics, Grenoble, France, Oct. 3-6, 2006. - 1424402042 ; , s. 88-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The Gerchberg-Saxton algorithm, which is often used for phase retrieval in free space diffractive optics, is here applied to the problem of signal retrieval in dualoutput (phase-diverse) photonic time-stretch systems. Using wide band noise covering the first two fading frequencies as an input signal we numerically analyze the proposed algorithm for different numbers of iterations, measurement noise levels, mis-estimation of system parameters and optical modulation depths. We show that the algorithm can successfully compensate for non-linear distortion of the signal due to chromatic dispersion, that it is robust to noise and mis-estimated system parameters, and that it converges very rapidly (within ten iterations). For lower signal-to-noise ratios and/or smaller modulation depths it also provides a non-iterative method of retrieving the inputsignal.
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| 2. |
- Wiberg, Andreas, 1978, et al.
(författare)
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Evaluation of All-Optical Demultiplexing in Millimeter-Wave Subcarrier-System for Wireless Communication
- 2006
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Ingår i: Proceedings of International Topical Meeting on Microwave Photonics. - 1424402042 ; Paper T2.2
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Konferensbidrag (refereegranskat)abstract
- In this paper, a scheme for multiplexing millimeter-wave carriers on a single optical carrier and using an all-optical millimeter-wave demultiplexer is presented. The optical demultiplexing of radio-over-fiber signals is based on dual sideband modulation with suppressed optical carrier combined with the filtering properties of dual over-written fiber Bragg gratings. The performance of the system is investigated using a single optical carrier and independent data modulated millimeterwave signals at 20 and 40 GHz. The signals are transmitted over optical fiber, demultiplexed and wirelessly distributed to a mobile unit. It is found that performance of the demultiplexing using fiber Bragg gratings gives less than -40 dB electrical power interchannel crosstalk and the spurious free dynamic range is measured to be 80 dB.Hz^(2/3). Furthermore, PSK, QAM and ASK PRBS modulated dataup to 2.5 Gb/s are successfully transmitted through thewireless link.
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