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The FSO that was patented a year ago is now available commercially. He is selling it for $3000, to make it ourselves would be around $1500. Buy the device reverse engineer it and publish the math theory with gerber files etc. on the Internet.
The FSO nodes can do 500m at 125Meg with 10mw laser. 1watt even further, but eye safety becomes a problem. He uses 800nm which can punch through fog and rain.
=== Margaritis, Georgios ===
http://scratchpad.wikia.com/wiki/OpticPatents
http://www.margaritis.com/Products.html ''Commercial release''
Multi-area FSO receiver using lenses from http://www.thorlabs.com
http://www.freepatentsonline.com/y2007/0053698.html
http://www.patentstorm.us/applications/20070053698/fulltext.html
In free space optics an optical transceiver sends and receives optical signals from a second transceiver located some distance away. Alignment of the two transceivers is crucial for error free transmission of the signals exchanged between the two transceivers.
A photodetector is used in each of the transceivers to convert the optical signals to electrical signals to be processed by the electronic components of the transceiver. However, even if the transceivers are initially aligned properly, optical aberrations due to weather conditions or aging of the optical or mechanical components of the transceivers and misalignment of the transceivers due to mechanical forces from wind or other factors can lead to improper focusing of the incoming beam onto the photodetector, thus leading to errors in the transmission. Also, to detect high-speed optical signals it is necessary to use small low capacitance photodiodes, which further reduces the detection area and makes optical alignment of the receiver and transmitter difficult.
Each of the TIA signal receiving strenght is monitored with an A/D converter channel on a [[FpGa]]. The FPGA moves the focusing lens over the TIA providing the best [[SerDes]] signal in PID control loop via MX80L Parker Daedal([RcServos]) linear positioner.
In this patent, a novel detection apparatus is introduced that uses a combination of photodetectors and transimpedance amplifiers in close proximity to reduce capacitance and distributed over a wide detection area, thus eliminating the issues related to prior art photodetectors. Uses FPGA to detect FSO signal. Transceiver ic Intel [[Lxt971Aphy]], servo motors in x,y,z direction. See [[RcServos]]. Ethernet transceiver '''Intel [[Lxt971Aphy]]''. The Ethernet transceiver IC 210 is connected to an isolation transformer 211 , such as four '''Pulse PE68515'''. The [[SerDes]] 208 is also connected to a laser driver 213 , such as a Maxim '''MAX 3668''' [[TransimpedenceAmp]], that drives a single mode laser module 214 , such as a '''Sumitomo SLT4460'''. The fiber 35 is connected at one end to the output of the laser module 214 and coupled at the other end to the transmit optics 7.
FIG. 1a shows one embodiment of the receive optics of the transceiver of this invention. It includes a lens 22, such as a plano-convex lens from Thorlabs, attached to the front end of a tube 6. A single planoconvex lens or a system of lenses 23 (plano-convex) and 24 (ball lens), along with lens 22 (plano-convex) focus an incoming laser beam 21 onto a photodetector 25, as described later in this invention Several lens vendors offer lenses that can be used in this invention, such as those from Thorlabs or Edmund Optics http://www.edmundoptics.com. The photodetector 25 is attached to a motorized X-Y-Z stage 26, such as a set of three MX80L Parker Daedal - [[RcServos]] - stages in an X-Y-Z configuration with an associated driver such as a ViX driver. A band-pass optical filter 29, such as an Edmund Optics DWDM dielectric bandpass filter, is also used in the optical path to allow only predetermined optical wavelengths to pass through.
'''Fermionics FD100''' photodiodes are connected to a plurality of transimpedance amplifiers '''Maxim MAX 3657'''
All the plus outputs of all TIAs are connected together...
http://www.freshpatents.com/-dt20090129ptan20090031383.php
The FSO nodes can do 500m at 125Meg with 10mw laser. 1watt even further, but eye safety becomes a problem. He uses 800nm which can punch through fog and rain.
=== Margaritis, Georgios ===
http://scratchpad.wikia.com/wiki/OpticPatents
http://www.margaritis.com/Products.html ''Commercial release''
Multi-area FSO receiver using lenses from http://www.thorlabs.com
http://www.freepatentsonline.com/y2007/0053698.html
http://www.patentstorm.us/applications/20070053698/fulltext.html
In free space optics an optical transceiver sends and receives optical signals from a second transceiver located some distance away. Alignment of the two transceivers is crucial for error free transmission of the signals exchanged between the two transceivers.
A photodetector is used in each of the transceivers to convert the optical signals to electrical signals to be processed by the electronic components of the transceiver. However, even if the transceivers are initially aligned properly, optical aberrations due to weather conditions or aging of the optical or mechanical components of the transceivers and misalignment of the transceivers due to mechanical forces from wind or other factors can lead to improper focusing of the incoming beam onto the photodetector, thus leading to errors in the transmission. Also, to detect high-speed optical signals it is necessary to use small low capacitance photodiodes, which further reduces the detection area and makes optical alignment of the receiver and transmitter difficult.
Each of the TIA signal receiving strenght is monitored with an A/D converter channel on a [[FpGa]]. The FPGA moves the focusing lens over the TIA providing the best [[SerDes]] signal in PID control loop via MX80L Parker Daedal([RcServos]) linear positioner.
In this patent, a novel detection apparatus is introduced that uses a combination of photodetectors and transimpedance amplifiers in close proximity to reduce capacitance and distributed over a wide detection area, thus eliminating the issues related to prior art photodetectors. Uses FPGA to detect FSO signal. Transceiver ic Intel [[Lxt971Aphy]], servo motors in x,y,z direction. See [[RcServos]]. Ethernet transceiver '''Intel [[Lxt971Aphy]]''. The Ethernet transceiver IC 210 is connected to an isolation transformer 211 , such as four '''Pulse PE68515'''. The [[SerDes]] 208 is also connected to a laser driver 213 , such as a Maxim '''MAX 3668''' [[TransimpedenceAmp]], that drives a single mode laser module 214 , such as a '''Sumitomo SLT4460'''. The fiber 35 is connected at one end to the output of the laser module 214 and coupled at the other end to the transmit optics 7.
FIG. 1a shows one embodiment of the receive optics of the transceiver of this invention. It includes a lens 22, such as a plano-convex lens from Thorlabs, attached to the front end of a tube 6. A single planoconvex lens or a system of lenses 23 (plano-convex) and 24 (ball lens), along with lens 22 (plano-convex) focus an incoming laser beam 21 onto a photodetector 25, as described later in this invention Several lens vendors offer lenses that can be used in this invention, such as those from Thorlabs or Edmund Optics http://www.edmundoptics.com. The photodetector 25 is attached to a motorized X-Y-Z stage 26, such as a set of three MX80L Parker Daedal - [[RcServos]] - stages in an X-Y-Z configuration with an associated driver such as a ViX driver. A band-pass optical filter 29, such as an Edmund Optics DWDM dielectric bandpass filter, is also used in the optical path to allow only predetermined optical wavelengths to pass through.
'''Fermionics FD100''' photodiodes are connected to a plurality of transimpedance amplifiers '''Maxim MAX 3657'''
All the plus outputs of all TIAs are connected together...
http://www.freshpatents.com/-dt20090129ptan20090031383.php
