OpticPatents

TableOfContents

Margaritis, Georgios
http://www.margaritis.com/Products.html Commercial release Multi-area FSO receiver using lenses from http://www.thorlabs.com


 * patent us20070053698
 * 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, such as one from OpticalManufacturers, 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

LSA INC
http://www.google.co.za/patents?id=c0MIAAAAEBAJ&printsec=abstract&zoom=4&source=gbs_overview_r&cad=0#v=onepage&q&f=false

Beam splitters and polarizers. http://www.google.co.za/patents?id=z_EiAAAAEBAJ&printsec=drawing&zoom=4#v=onepage&q&f=false

http://www.lsainc.com/technologies/shiptoshore/shiptoshore.htm

national technical reports
Url of this page: http://bit.ly/n3CTH http://www.ntis.gov/ See OpticalPapers

AOptix Technologies
http://www.aoptix.com * pat.6721510 Atmospheric optical data transmission system The patent reference various publications on FSO.

http://www.patentstorm.us/patents/7286766/description.html Referring to FIG. 4, in one embodiment, the adaptive optical power regulator 240 includes a variable optical attenuator 405 with electrical control input vc, an optical tap/detector 410 to tap off a portion of the output Pout of VOA 405(10% tap in this example) and convert that portion to an electrical signal vm. The tap detector 410 is described by a possibly non-linear relationship vm=D(Pout) and the variable optical attenuator 405 is described by a possiblynon-linear relationship Pout=K(vc) Pin, where Pin and Pout are the input and output optical power levels. A combined tap/detector assembly, such as those manufactured by http://www.diconfiberoptics.com/, Inc. of Richmond, Calif. may be used. A logarithmic converter, such as the AD8304 manufactured by Analog Devices of Norwood, Mass. may be used to provide the non-linear function D. The output of tap/detector 410 is one input to a control amplifier 415. The other input to the controlamplifier 415 is a set point input from, for example, a digital to analog converter (DAC) 420. Control amplifier 415 compares the tap detector output vm to the set point voltage vo from DAC 420 and generates an appropriate control voltagevc for VOA 405.

http://www.edmundoptics.com/onlinecatalog/displayproduct.cfm?productID=2762

Tap detector
http://diconfiberoptics.com/products/?prod=0005&menu=psv&sub=1 Uni-directional Tap/Detectors reduce the cost of power monitoring by combining the tap and PIN photo-diode PIN in a single component without the need for an in-line isolator on the output port.

Optical receiver
http://www.freepatentsonline.com/y2007/0053699.html

EDFA
EDFA are used to receive incoming laser light in FSO system.

MRV communications
http://cgi.ebay.com/MRV-TS1000-Terescope-Free-Space-Optics-wireless-link_W0QQitemZ260242168637QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3c97a45b3d

Assignee: Science Applications International Corporation Press Releases MRV Communications Granted Patent on Breakthrough Free Space Optics Technology April 24th, 2002 Key Benefits - No O-E-O (Optical-Electrical-Optical) Conversion Required on... http://www.patentstorm.us/patents/7402785.html

Hovering airships and corrective lenses http://www.edn.com/article/CA6356080.html?text=free+space+optics

http://www.edn.com/article/CA6339271.html

Harris corporation
http://www.patentstorm.us/applications/20050069323/fulltext.html

Geodesy
http://www.futurend.co.uk/free-space-optics/index.php ?GeoDesy FSO is part of the ?GeoDesy Group ?GeoDeys's patented Automatic Inbound Power Control guarantees

Corrective lenses

 * http://www.edn.com/article/CA6466224.html??text=free+space+optics Correcitve lenses


 * http://www.holochip.com/

Alcatel
* pat.7269360 High dynamic receiver for free space optics application * http://www.freepatentsonline.com/EP1398893.html  Receiver for a free space optics system

Terabeam
pat.7072543 Extended source transmitter for free space optical communication system. * http://www.patentstorm.us/patents/7072543/fulltext.html fiber coupling fso * Pat.680442 Integrated optic component for binocular FSO transceiver

* pat. 6868236 Mode scrambled optical signals to mitigate atmospheric effects. SPIE Sidrovich Jan.2002 as reference.

LightPointe
Has various patents

EDFA - Erbium doped fiber amplifiers.

AT&T Bell laboratories
* pat.5343032 Diode-clamped optical receiver

Noah industries
http://www.noahcorp.com/ * Pat: 7212706 Active alignment system for free space optics http://www.noahcorp.com/photonicsinstruments/fooe-eoconverter.htm. NOAH's Fiber-Optic OE-EO Converter serves as a general purpose high-bandwidth fiber-optical converter. It contains an optical-to-electrical and an electrical-to-optical converter in one box. http://www.noahcorp.com/photonicsinstruments/fooe-eoconverter.htm

Oplink communications
http://www.oplink.com/ * Pat: 6894266 Single chip APD bias circuit

Oplink is a leading provider of comprehensive networking com- ponents, subsystems, and custom Optical Manufacturing Solution (OMS) services that offers bandwidth creation, amplification, switching, routing, signal conditioning and protection solutions to the tele- communications, enterprise net- working, and MSO equipment companies."

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Wireless fiber coupled telecommunications system based on atmospheric transmission of laser signals. 6348986

Canon Kabushiki Kaisha

 * Pat.7409161 Free Space Optics communication apparatus and free space optics communication.
 * Pat.7289737 Communication optical system and free-space optics communication apparatus.
 * http://www.patentstorm.us
 * Pat.7409161 Free Space Optics communication apparatus and free space optics communication.
 * Pat.7289737 Communication optical system and free-space optics communication apparatus.
 * http://www.patentstorm.us
 * http://www.freepatentsonline.com/7450855.html Plural FSO receiver
 * http://www.freepatentsonline.com/5627669.html  Links to various other patents

photodiode setup
http://www.patentstorm.us/patents/6819873/fulltext.html

Trex corporation
http://www.patentstorm.us/patents/6347001/fulltext.html

Method and apparatus for free-space optical switching
http://www.patentstorm.us/patents/7333688/fulltext.html

... States Patent 7,333,688 Doerr,  et al. February 19, 2008 Method and apparatus for free-space optical switching Abstract An apparatus and method are provided for manipulating light beams propagated through PLCs in free space. Light ...

Atmospheric optical transmission
multi-channel optical switch, optical communication arrangement

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http://www.freepatentsonline.com/7058307.html

http://www.patentstorm.us/patents/6868519.html scintallation and reed solomon encoding

http://www.seas.harvard.edu/hbbcl/fsoc.html

fraunhofer patents on LED comms

 * http://www.bemri.org Visible Light Communication Thorlabs detector DET210 , Newport 818-IR
 * http://www.freepatentsonline.com/y2010/0054748.html
 * http://www.hhi.fraunhofer.de/en/solutions/overview/
 * http://www.hhi.fraunhofer.de/en/press/press-and-media/record-communication-speeds-over-ceiling-lights/?0= 500Meg/sec using white leds
 * http://inhabitat.com/2010/03/11/scientists-find-way-to-turn-led-lights-into-wireless-internet-source/ LED SWITCHING 230MEGS
 * http://nanopatentsandinnovations.blogspot.com/2010/03/fraunhofer-ibmt-developing-wireless.html

links
FreeSpaceOptics