Debunking the recurring myth of a magic wavelength for free-space optics

Korevaar, Eric J.; Kim, Isaac I.; McArthur, Bruce

doi:10.1117/12.460580

Cited by 13 publications

(4 citation statements)

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“…Exact calculations and practical measurements (Ref. 2,3,4) indicate that longer wavelengths are less attenuated under light to moderate fog conditions, whereas under strong fog attenuation is equal for all wavelengths. There are even indications for a slight advantage of shorter wavelengths under extreme conditions.…”

Section: Availability Considerations For Fso Linkpath and Deploymentmentioning

confidence: 96%

Ethernet access network based on free-space optic deployment technology

Gebhart

Leitgeb

Birnbacher

et al. 2004

Free-Space Laser Communication Technologies XVI

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The satisfaction of all communication needs from single households and business companies over a single access infrastructure is probably the most challenging topic in communication technology today. But even though the so-called "Last Mile Access Bottleneck" is well known since more than ten years and many distribution technologies have been tried out, the optimal solution has not yet been found and paying commercial access networks offering all service classes are still rare today. Conventional services like telephone, radio and TV, as well as new and emerging services like email, web browsing, online-gaming, video conferences, business data transfer or external data storage can all be transmitted over the well known and cost effective Ethernet networking protocol standard. Key requirements for the deployment technology driven by the different services are high data rates to the single customer, security, moderate deployment costs and good scalability to number and density of users, quick and flexible deployment without legal impediments and high availability, referring to the properties of optical and wireless communication. We demonstrate all elements of an Ethernet Access Network based on Free Space Optic distribution technology. Main physical parts are Central Office, Distribution Network and Customer Equipment. Transmission of different services, as well as configuration, service upgrades and remote control of the network are handled by networking features over one FSO connection. All parts of the network are proven, the latest commercially available technology. The set up is flexible and can be adapted to any more specific need if required.

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Section: Availability Considerations For Fso Linkpath and Deploymentmentioning

confidence: 96%

Ethernet access network based on free-space optic deployment technology

Gebhart

Leitgeb

Birnbacher

et al. 2004

Free-Space Laser Communication Technologies XVI

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“…The attenuation from dust and atmospheric aerosols are resulting from Mie scattering particles, which depend on the volume of the atmospheric aerosols, and the effects of absorption electromagnetic will be relatively small comparing with Mie scattering, therefore, the scattering coefficient can be computed form the visibility distance and wavelength of the incident beam. The range of visibility is related with concentration of dust as [5] :…”

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confidence: 99%

Experimental Study of the Influence of Dust Particle on Link Range of Free Space Laser Communication System

Jenan A. Khalati

2022

cbej

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تم إجراء دراسة تجريبية على توهين الطيف لأنظمة الاتصالات الضوئية للفضاء الحر (FSO) التي تعمل بأطوال موجية مرئية وقريبة من الأشعة تحت الحمراء (NIR) (650 نانومتر و 850 نانومتر و 1550) تحت الغبار. يتم تكوين الغبار والتحكم فيه بشكل متجانس على طول غرفة الغلاف الجوي المخصصة بأبعاد (93 * 63 * 60) سم.

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“…Thus, a strict radiation fog is a night time occurrence, although it may begin to form by evening twilight. Often it does not dissipate until after sunrise and has particle size distribution around 1-3 m [5]. Hence, it should affect more the short wavelength links and barely the 10 micron window.…”

Section: Theory and Experimentsmentioning

confidence: 97%

“…Radiation fog is the typical fog at that place. Advection fog, which is caused by the advection of moist air over a cold surface, cooling the air below the dew point, is known to display the largest particle size distribution [5] offering the worst conditions to 10 m light. Coastal upslope fog, which is formed when sea air flows upward over rising terrain and is adiabatically cooled to or below its dew point, also displays large particle size.…”

Section: Theory and Experimentsmentioning

confidence: 99%

New proposal for real time measurements of visibility and signal levels in free space optical systems

Colvero

Cordeiro

Weid

SBMO/IEEE MTT-S International Conference on Microwave and Optoelectronics, 2005.

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The authors demonstrate a new method for recording precision measurements of visibility for free space optics systems correlated with received optical signal levels in three links using different wavelengths. The experimental results had been acquired with the use of the links in near, mid and far infrared transmission windows in the atmosphere. Our results proved that 10 m window is considerable better than the 1600 nm and 800 nm ones in dense and thick fog conditions.

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Debunking the recurring myth of a magic wavelength for free-space optics

Cited by 13 publications

References 0 publications

Ethernet access network based on free-space optic deployment technology

Ethernet access network based on free-space optic deployment technology

Experimental Study of the Influence of Dust Particle on Link Range of Free Space Laser Communication System

New proposal for real time measurements of visibility and signal levels in free space optical systems

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