Free-space optical communication at 1.55 μm and 4.85 μm and turbulence measurements in the evaporation layer

John Zeller; Tariq Manzur

doi:10.1117/12.978292

19 October 2012 Free-space optical communication at 1.55 <0x03bc<m and turbulence measurements in the evaporation layer

John Zeller, Tariq Manzur

Proceedings Volume 8540, Unmanned/Unattended Sensors and Sensor Networks IX; 85400C (2012) https://doi.org/10.1117/12.978292
Event: SPIE Security + Defence, 2012, Edinburgh, United Kingdom

Abstract

Free-space optics (FSO) holds the potential for high bandwidth communication in situations where landline communication is not practical, with relatively low cost and maintenance. The short-wave infrared (SWIR) and midwave infrared (MWIR) bands contain atmospheric transmission windows spanning approximately 1.50-1.75 μm and 4.6- 4.9 μm, respectively. Transmission coefficients and losses were modeled using MODTRAN for optical path lengths of up to 2 km to for various atmospheric conditions. The determination of the refractive index structure parameter C_n ² is useful in calculating the time-dependent Fried parameter, r₀, which provides an indication of the magnitude of the phase distortion of an optical wavefront by scintillation in accordance with the Kalomogorov model. By better understanding the effects of turbulence and C_n ² on FSO transmission through modeling and experimental measurements, measures can be implemented to reduce the bit error rate and increase data throughput, enabling more efficient and accurate communication links. FSO beam optimization is achievable using a Shack-Hartmann wavefront sensor, whereby wavefront distortion of a transmitted beam is measured to compensate in real time for the effects of turbulence to provide optimized FSO reception. Using advanced techniques and compensation methods, limitations associated with infrared FSO transmission and reception in the evaporation layer may be overcome or circumvented to provide high bandwidth communication through turbulence and/or adverse weather conditions.

Citation Download Citation

John Zeller and Tariq Manzur "Free-space optical communication at 1.55 <0x03bc<m and turbulence measurements in the evaporation layer", Proc. SPIE 8540, Unmanned/Unattended Sensors and Sensor Networks IX, 85400C (19 October 2012); https://doi.org/10.1117/12.978292

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
12 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Free space optics

Atmospheric optics

Atmospheric modeling

Turbulence

Atmospheric propagation

Atmospheric particles

Mid-IR

Show All Keywords

Keywords/Phrases

Search In:

Publication Years