Optical Antenna Gain 2: Receiving Antennas

Degnan, John J.; Klein, Bernard

doi:10.1364/ao.13.002397

Cited by 72 publications

(29 citation statements)

References 3 publications

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“…In the present calculation, we assume that the signal source is sufficiently far away so that plane waves impinge on the receiver aperture. The receiver gain is written as [7] ( ) = 10 log + 10 log(1 − ) + 10log This on-axis receiving efficiency for optimized focused eccentric-pupil Cassegrain antenna system ( 2 = 150 , = 0, = 1, = 0) is plotted in figure 9. When = 830 , the receiving antenna gain is 121dB.…”

Section: Optical Antenna In Axis Alignment Situation Gain Analysismentioning

confidence: 99%

Optimal design of a new type space laser communication optical system

Yan¹,

Deng²,

Zhang³

2013

SPIE Proceedings

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A design of a laser communications optical system with high transmitting and receiving performance is given. The traditional on-axis Cassegrain optical antenna has the default that the transmitting and receiving power decreased greatly because of the obscuration of the secondary mirror. Considering that the eccentric-pupil Cassegrain optical antenna is designed. The optical antenna system in transceiver has been designed by means of CODEV software. It improves the efficiency of transmitting and receiving power effectively. Its properties have been analyzed, such as gain, image quality, and transmission efficiency. Meanwhile, the materials of optical elements have been analyzed. The power decline curve has been obtained by means of the detailed analysis of antenna system in partial axis situation. The system includes transmitter channel, receiving channel and experiment channel. It can realize the functions of transmitter-receiver isolation and multi-light ways using dichroic mirrors and beam splitting prisms. The system volume and weight are reduced greatly. The complexity of conventional laser communication system is reduced enormously at the same time. It has important reference significance and application value. INTRODUNCTIONLaser communication technology can improve the performance of space communication systems by offering higher carrier frequency and information bandwidth. However, the previous on-axis Cassegrain antenna cannot meet the high performance requirement of terminal gradually. For example, the first generation optical communications demonstrator (OCD-1) and the second generation optical communications demonstrator (OCD-2) were developed for airborne applications like air-to-ground and air-to-air optical links at Jet Propulsion Laboratory (JPL) [1]. Their optical antennas were all on-axis Cassegrain systems. Over 25% of the power was lost because of the secondary obscuration and primary truncation. Better alignment between the primary and secondary is expected to improve the performance[2]. Furthermore, miniaturization and integration is an important trend of laser communication terminal.In this paper, a new kind of laser communications optical system is designed. It uses an unobscured eccentric-pupil Cassegrain optical antenna to improve the efficiency of transmitting power and receiving power. The system can realize the functions of transmitter-receiver isolation and multi-light ways using dichroic mirrors and beam splitting prisms.Meanwhile, the volume and weight of the system are greatly reduced. In this system, only one large format detector is * yppoptics@163.com; phone+86 029 88887572; fax +86 029 88887600; www.opt.ac.cn

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Section: Optical Antenna In Axis Alignment Situation Gain Analysismentioning

confidence: 99%

Optimal design of a new type space laser communication optical system

Yan¹,

Deng²,

Zhang³

2013

SPIE Proceedings

View full text Add to dashboard Cite

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“…Other features will be addressed in sequel. In general, the present work adopts those assumptions and conditions typically recognized in the WOC literature (e.g., [2,4,5]). …”

Section: System Modelmentioning

confidence: 99%

Power optimization of wireless optical communication with log-square-Ricean fading

Liu

2012

Appl. Opt.

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It has been important to optimize the transmitter power in wireless optical communication systems. The conventional approach was based on the reciprocal Pareto model. In this paper, the investigation is extended to a more general scenario where the instantaneous signal-to-noise ratio follows the log-square-Ricean distribution. Accordingly, the optimization model is established. The conventional model thus becomes a special case of the new model. It is shown that the new model can be analytically solved. The sample solutions clearly show how the optima of transmitter power change when the log-square-Ricean profile changes. These results would provide useful guidelines to system design.

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“…For the case of the Gaussian beam, the transmitter telescope gain is G T ≈ (2πW T /λ) 2 , where Wis the rms width of the Gaussian intensity distribution over the transmitter aperture [1], and the transmitter pointing loss factor is L T (G T , Â)=exp(−G T Â 2 ). The receiver telescope gain can be expressed as [9]: G R ≈ (πD R /λ) 2 . In the case of the receiver telescope with a sufficiently wide field of view, the receiver pointing loss factor is L R (G R , Γ) ≈ 1 [1].…”

Section: System Modelmentioning

confidence: 99%