Diode laser imaging system performance analysis and design

Wei Ran Wang; Yi Fei Wang

doi:10.1117/12.140836

12 February 1993 Diode laser imaging system performance analysis and design

Wei Ran Wang, Yi Fei Wang

Proceedings Volume 1763, Airborne Reconnaissance XVI; (1993) https://doi.org/10.1117/12.140836
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

Diode laser imaging is one of the advanced sensors. It is best suited for the aerospace flight environment. We have developed a 40^K X 8 bit pixels/sec diode laser imaging system, and this system was authenticated by specialists last year. This paper describes several important problems for intensity imaging which include improving laser power utilization ratio and receiving sensitivity in a laser imaging system. Improvement SNR of an imaging system is a criterion of analysis and comparison. Waveform design of both the maximum power limited and average power invariant are analyzed separately. In order to understand avalanche gain contribution to receiver SNR, performance comparison of receiving is evaluated for detection type and operation state. The comparison includes intensity modulated (IM)/coherent detection (CD) and IM/Direct detection (DD) for different avalanche gain values and different photodetector load resistance values. According to the relations between receivable return power and SNR, a series of curves are calculated by computer. These curves clearly show the best detecting type for various receiver power levels. These results of analyses provide the theoretical basis of transmitter and high sensitivity receiver design. These analyses also show that in intensity imaging system correct waveform selection can make 4 dB improvement on SNR and reasonable receive trade-off design can make about 30 dB improvement on SNR.

Citation Download Citation

Wei Ran Wang and Yi Fei Wang "Diode laser imaging system performance analysis and design", Proc. SPIE 1763, Airborne Reconnaissance XVI, (12 February 1993); https://doi.org/10.1117/12.140836

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