Cross-talk analysis in a telecentric adaptive free-space optical relay based on a spatial light modulator

2006 ◽  
Vol 45 (1) ◽  
pp. 63 ◽  
Author(s):  
Diego Gil Leyva ◽  
Brian Robertson ◽  
Charley J. Henderson ◽  
Timothy D. Wilkinson ◽  
Dominic C. O'Brien ◽  
...  
Keyword(s):  
Cross Talk ◽  
Free Space ◽  
Spatial Light Modulator ◽  
Free Space Optical ◽  
Light Modulator

Spatial Light Modulator and Its Applications in Free-Space Optical Communications

2016 ◽  
Vol 53 (5) ◽  
pp. 050008
Author(s):  
陈沁 Chen Qin ◽  
王华村 Wang Huacun ◽  
胡鑫 Hu Xin ◽  
文龙 Wen Long
Keyword(s):  
Optical Communications ◽  
Free Space ◽  
Spatial Light Modulator ◽  
Free Space Optical ◽  
Light Modulator

Reconfigurable free-space optical interconnections with a phase-only liquid-crystal spatial light modulator

1992 ◽  
Vol 31 (26) ◽  
pp. 5527 ◽  
Author(s):  
Thomas H. Barnes ◽  
Tomoaki Eiju ◽  
Kiyofumi Matsuda ◽  
Hiroyuki Ichikawa ◽  
Mohammed R. Taghizadeh ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Free Space ◽  
Spatial Light Modulator ◽  
Free Space Optical ◽  
Light Modulator ◽  
Optical Interconnections

Cross-talk compensation of a spatial light modulator for iterative phase retrieval applications

2016 ◽  
Vol 55 (4) ◽  
pp. 802 ◽  
Author(s):  
Pierre Gemayel ◽  
Bruno Colicchio ◽  
Alain Dieterlen ◽  
Pierre Ambs
Keyword(s):  
Cross Talk ◽  
Spatial Light Modulator ◽  
Phase Retrieval ◽  
Light Modulator

scholarly journals Free-Space Optical Beam Steering for Wireless Communications

2021 ◽  
Author(s):  
Christopher Mekhiel
Keyword(s):  
Wireless Communications ◽  
Cross Talk ◽  
High Frequency ◽  
Free Space ◽  
Beam Steering ◽  
Optical Beam ◽  
Outdoor Environment ◽  
Switching Frequency ◽  
External Signal ◽  
Free Space Optical

The implementation of optical of wireless communications (OWC) requires the use of a light-emitting-diode (LED) or laser diode (LD). Due to significant path loss exhibited by these sources in an outdoor environment, an unobstructed point-to-point link must be maintained in order to increase the signal-to-noise ratio (SNR) at the receiver. This thesis considers a solution to alleviate the fundamental limitations of the OWC channel in an outdoor environment by investigating optical beam steering (OBS) to increase the signal strength in the desired direction. Conventional methods to implement on OBS use a microelectromechanical (MEMS) mirror or a spatial light modulator (SLM) which both suffer from low switching frequency. A high frequency OBS device can be created by using optical phased array (OPA). An electro-optic modulator (EOM) such as LiNbO3 can be used to create an OPA but can not be directly integrated in silicon. For monolithic silicon-on-insulator (SOI) solutions, previous literature uses thermo-optic couplers on SOI to implement the OPA, however this introduces the issue of thermal cross-talk. Therefore, this thesis focuses on the use of silicon as the EOM for use in an OPA to create a high frequency monolithic OBS. Our contributions consist of providing a design method for a OBS SOI device which exhibits minimum internal cross-talk and provides propagation in free-space with high directivity and a wide steering range. Additionally, propose the use of an internal heterodyne optical phase locked loop (PLL) to stabilize the OBS instead of an external signal processor for phase correction. This optical PLL reduces beam jitter, minimizes beam squint, and provides active tracking for the output beam towards the receiver. We have also characterized a shadowing scenario in an OWC channel which OBS has the potential to alleviate. Moreover, we simulated the optical far-field radiation pattern from a SOI waveguide to free-space which has not been demonstrated in previous research. Finally, our simulation results of a SOI OPA demonstrates the coherent combining capability of OBS using MEEPTtm and the Optiwavetm suite.

Adaptive beam steering implemented in a ferroelectric liquid-crystal spatial-light-modulator free-space, fiber-optic switch

2002 ◽  
Vol 41 (23) ◽  
pp. 4904 ◽  
Author(s):  
Mathias Johansson ◽  
Sverker Hård ◽  
Brian Robertson ◽  
Ilias Manolis ◽  
Timothy Wilkinson ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Free Space ◽  
Spatial Light Modulator ◽  
Fiber Optic ◽  
Beam Steering ◽  
Ferroelectric Liquid Crystal ◽  
Light Modulator

scholarly journals Implementation of a Phase Only Spatial Light Modulator as an Atmospheric Turbulence Simulator at 1550 nm

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Carlos Font ◽  
Freddie Santiago ◽  
G. Charmaine Gilbreath ◽  
David Bonanno ◽  
Blerta Bajramaj ◽  
...  
Keyword(s):  
Atmospheric Turbulence ◽  
Free Space ◽  
Spatial Light Modulator ◽  
Light Propagation ◽  
New Technologies ◽  
Short Wave ◽  
Controlled Environment ◽  
Light Modulator ◽  
Propagation Of Light ◽  
Laser Communications

Modeling and simulating atmospheric turbulence in a controlled environment have been a focus of interest for scientists for decades. The development of new technologies allows scientists to perform this task in a more realistic and controlled environment and provides powerful tools for the study and better understanding of the propagation of light through a nonstatic medium such as the atmosphere. Free space laser communications (FSLC) and studies in light propagation through the atmosphere are areas which constantly benefit from breakthroughs in technology and in the development of realistic atmospheric turbulence simulators, in particular (Santiago et al. 2011). In this paper, we present the results from the implementation of a phase only spatial light modulator (SLM) as an atmospheric turbulence simulator for light propagation in the short-wave infrared (SWIR) regime. Specifically, we demonstrate its efficacy for its use in an FSLC system, at a wavelength of 1550 nm.

Sign in / Sign up

Export Citation Format

Share Document