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Title |
Performance analysis of microwave carrier for Ku-band satellite signal |
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Author |
M. R. H. Khan, M. F. Islam, G. Sarowar† and T. Reza |
| Citation |
Vol. 17 No. 4 pp. 4-13 |
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Abstract |
The system analysis and the experimental demonstration of an optically generated microwave carrier signal by heterodyning of two lasers is described in this paper. The carrier signal is used for downconversion of the Ku-band (10.7 12.75 GHz) satellite signal received from a phased array antenna (PAA) of a DVB-S (Digital Video Broadcasting-Satellite) system. The impact of the laser parameters (i.e., optical power and linewidth) on the quality of the generated carrier (i.e., phase stability and carrier-to-noise ratio) is analyzed for a 25×64 elements PAA system. It is experimentally demonstrated that, in order to have an optically generated carrier to meet the required performance for the Ku-band satellite reception, the lasers linewidth should be in the order of tens of Hz, with a maximum relative intensity noise (RIN) of -123 dB/Hz and a minimum optical power of 3.1 mW. An optical frequency locked loop (OFLL) to stabilize the generated carrier is also implemented. The carrier is stabilized within the maximum allowable ±4 MHz drift by using the proposed OFLL and gives a loop settling time of 11.5 ?s. |
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Keywords |
phased array antenna, optical heterodyning, carrier generation, Ku-band satellite signal, laser linewidth, stability, optical frequency locked loop (OFLL). |
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