Low-cost large aperture telescopes for optical communications

2006 ◽  
Author(s):  
Hamid Hemmati
Keyword(s):  
Optical Communications ◽  
Low Cost ◽  
Large Aperture

scholarly journals Up-Conversion Sensing of 2D Spatially-Modulated Infrared Information-Carrying Beams with Si-Based Cameras

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3610
Author(s):  
Adrián J. Torregrosa ◽  
Emir Karamehmedović ◽  
Haroldo Maestre ◽  
María Luisa Rico ◽  
Juan Capmany
Keyword(s):  
Optical Communications ◽  
Near Infrared ◽  
Nonlinear Crystal ◽  
Signal To Noise Ratio ◽  
Low Cost ◽  
Infrared Image ◽  
Complementary Metal Oxide Semiconductor ◽  
Local Oscillator ◽  
Oxide Semiconductor ◽  
Free Space Optical

Up-conversion sensing based on optical heterodyning of an IR (infrared) image with a local oscillator laser wave in a nonlinear optical sum-frequency mixing (SFM) process is a practical solution to circumvent some limitations of IR image sensors in terms of signal-to-noise ratio, speed, resolution, or cooling needs in some demanding applications. In this way, the spectral content of an IR image can become spectrally shifted to the visible/near infrared (VIS/NWIR) and then detected with silicon focal plane arrayed sensors (Si-FPA), such as CCD/CMOS (charge-coupled and complementary metal-oxide-semiconductor devices). This work is an extension of a previous study where we recently introduced this technique in the context of optical communications, in particular in FSOC (free-space optical communications). Herein, we present an image up-conversion system based on a 1064 nm Nd3+: YVO4 solid-state laser with a KTP (potassium titanyl phosphate) nonlinear crystal located intra-cavity where a laser beam at 1550 nm 2D spatially-modulated with a binary Quick Response (QR) code is mixed, giving an up-converted code image at 631 nm that is detected with an Si-based camera. The underlying technology allows for the extension of other IR spectral allocations, construction of compact receivers at low cost, and provides a natural way for increased protection against eavesdropping.

Large Aperture Diffractive Receiver for Deep Space Optical Communications

2015 ◽  
Author(s):  
Kevin L. Whiteaker ◽  
Robert G. Marshalek ◽  
Jeanette L. Domber ◽  
Robert Kaliski
Keyword(s):  
Optical Communications ◽  
Deep Space ◽  
Large Aperture

Performance Analysis of Large-Aperture Receiving and Selection of Aperture Size in Atmospheric Optical Communications

2009 ◽  
Vol 36 (11) ◽  
pp. 2957-2961 ◽  
Author(s):  
陈纯毅 Chen Chunyi ◽  
杨华民 Yang Huamin ◽  
姜会林 Jiang Huilin ◽  
佟首峰 Tong Shoufeng ◽  
范静涛 Fan Jingtao ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Optical Communications ◽  
Aperture Size ◽  
Large Aperture ◽  
Selection Of
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