Optical attenuator

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Topic: Optical attenuator

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	Optical attenuator - Wikipedia, the free encyclopedia
		Optical attenuator, in optical communications, is a device used to reduce the power level of an optical signal.
		Optical attenuators used in fiber optic communications systems may use a variety of principles for their functioning.
		Those using the gap-loss principle are sensitive to the modal distribution ahead of the attenuator, and should be used at or near the transmitting end, or they may introduce less loss than intended.
	en.wikipedia.org /wiki/Optical_attenuator (117 words)

	United States Patent Application: 0040208545
		An optical wavelength switch according to claim 1 wherein the first channel selective attenuator is for independently and selectively attenuating signals within each of a number of wavelength channels different from the number of wavelength channels in which the third channel selective attenuator is for independently and selectively attenuating signals.
		An optical wavelength switch according to claim 1 wherein the first dedicated optical path includes the first channel selective attenuator and wherein the channel selective attenuator is coupled within the first dedicated optical path by optical couplings consisting of a first optical coupling and a second optical coupling.
		An optical wavelength switch according to claim 41 wherein the redundant port is one of a plurality of redundant ports coupled to each of the first, second and third ports, the plurality of redundant ports including a redundant port within each dedicated optical path.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20040208545".PGNR.&OS=DN/20040208545&RS=DN/20040208545 (7808 words)

	United States Patent Application: 0020147470
		The optical device being responsive to an optical signal generated by the sensor, the optical signal generated by the sensor rep representing a state of a function of the selected body tissue to provide feedback to affect the activity of the optical signal source.
		The proximal end is adapted to couple to an optical signal receiver, the distal end is adapted to couple to a sensor; the fiber optic bundle delivers an optical signal from a coupled sensor intended to cause an optical signal receiver coupled to the proximal end to monitor characteristics of a selected body tissue.
		The optical signal source generating an optical signal intended to cause the optical stimulator located at a distal end to deliver an excitatory stimulus to a selected body tissue, the stimulus causing the selected body tissue to function as desired.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=/netahtml/PTO/search-adv.html&r=1&f=G&l=50&d=PG01&p=1&S1=20020147470&OS=20020147470&RS=20020147470 (13114 words)

	Passive optical range simulator device - Patent 4189233
		A fine adjustment attenuator assembly 24 is interposed in the optical path between the focusing lens 17 and the fiber end 18.
		The coiled length of optical fiber 20 is typically one half to one kilometer in length, wound on a storage spool 40 as a series of fully interleaved single layer windings using controlled tension to minimize fiber stress and achieve minimum optical loss.
		The tilted-glass-element primary attenuator of the present invention gives a "free space" characteristic to the beam path by the elimination of first surface reflection of energy back into the system under test, and the oppositely-angled flat glass elements of the fine adjustment attenuator prevents unwanted translation of beam position during transit therethrough.
	www.freepatentsonline.com /4189233.html (1964 words)

	OLA-15b Optical Attenuator (variable)
		The OLA-15b Optical Attenuator (variable) is a handy-sized, rugged optical attenuator for singlemode applications from 1260 to 1625 nm.
		A handy-sized, rugged instrument for variable attenuation of optical signals in singlemode applications.
		Attenuation settings are highly accurate and reproducible with a high return loss.
	www.acterna.com /global/products/descriptions/OLA-15 (243 words)

	Tektronix MBD: Products > Optical Attenuators OA5002 : Intro
		Because the OA5002 Optical Attenuator is GPIB Programmable, these units can be operated in a completely automated environment.
		Also, with its storable attenuation levels, the OA5002 Optical Attenuator are very useful for repeat measurements in manufacturing environments.
		The OA5002 is the attenuator of choice for SDH/SONET testing.
	www.tek.com /Measurement/Products/catalog/oa5002 (282 words)

	Submillisecond response variable optical attenuator based on sheared polymer network liquid crystal
		We demonstrate a variable optical attenuator (VOA) at λ=1.55 µm using a sheared polymer network liquid crystal (SPNLC).
		Submillisecond response variable optical attenuator based on sheared polymer network liquid crystal
		Y. Wu, Y. Lin, Y. Lu, H. Ren, Y. Fan, J. Wu, and S. Wu, "Submillisecond response variable optical attenuator based on sheared polymer network liquid crystal," Opt.
	www.opticsexpress.org /abstract.cfm?URI=OPEX-12-25-6382 (458 words)

	New Variable Optical Attenuator Offers Inexpensive, Reliable Solution - January, 2005
		Variable optical attenuators are important components in wavelength division multiplexed telecom systems, in which they balance power levels among channels for reliable transmission.
		A 400-µm-long variable optical attenuator could have a range of greater than 20 dB with a temperature change of less than 10 °C, according to the researchers' simulation.
		In fact, the attenuator is perfectly suited for integration as the input waveguide to or the output waveguide from an arrayed waveguide grating.
	www.photonics.com /spectra/research/XQ/ASP/preaid.218/QX/read.htm (576 words)

	Harrick - Diaphragm Optical Attenuator
		Attenuation is achieved by varying the diameter of the iris from 25mm to 0.5mm.
		Helpful for aligning FTIR spectrometers, precisely controlling the beam size, and eliminating stray radiation.
	www.harricksci.com /accessories/H_attenuator.cfm?R=0&A=N (28 words)

	Low losses for all-fibre attenuator and shutter: News from ProtoDel International
		The Mark II variable optical attenuator and shutter are the first in a new range of products, which we are confident will prove popular with design engineers and component buyers keen to improve performance and cut costs".
		Easy to configure, ProtoDel's new variable optical attenuator for single mode fibre and polarisation maintaining fibre applications, can be set to operate at any 'single' channel between 1300 and 1630nm, so eliminating the wavelength dependent loss (WDL) associated with broadband variable optical attenuators.
		Designed to outperform their industry counterparts, all ProtoDel components are manufactured using a continuous optical fibre, with no in-line interfaces to impede the quality of the signal transmitted.
	www.electronicstalk.com /news/prb/prb105.html (441 words)

	VARIABLE OPTICAL ATTENUATOR - Corning Inc. - November, 1998
		Features include an optical monitor port to avoid signal loss, a latching mechanism to maintain the output signal even with power loss, a package design that achieves athermalized operation from 0 to 70 °C and an electrical interface with a simple four-lead design.
		It is not dependent on free-space optical elements such as lenses or mirrors.
		Suitable for use in long-haul and metropolitan networks, these devices can be used for amplifier tilt control, channel equalization and optical signal attenuation.
	www.photonics.com /spectra/newprods/XQ/ASP/newprodidfo.1704/QX/read.htm (129 words)

	Attenuator
		optical attenuator: In optical communications, a device used to reduce the power level of an optical signal.
		The input attenuator uses a commutating capacitor to cancel the input capacitance of the FET buffer (see DC-10 MHz amp schematic).
		Attenuator Control An amplifier can handle only a limited range of input amplitudes before it begins to distort the signal.
	supersearching.com /k/attenuator.html (742 words)

	Sunrise Telecom Expands SunSet MTT's Fiber Optic Testing Capabilities With a Variable Optical Attenuator module
		The Variable Optical Attenuator Module is an important tool for determining a fiber link's optical margin, for performing insertion loss testing and verification, as well as for providing power control and equalization on the network.
		The Variable Optical Attenuator Module, along with the SunSet MTT family, will be demonstrated at CeBit 2004 (March 18-24, 2004) in Hannover, Germany at the Sunrise Telecom booth #D81 in Hall 013.
		In addition to its easy-to-use operations, the Variable Optical Attenuator module also supports automatic attenuation sequencing with preset profiles.
	www.cablemodemnews.com /publications/page679-786339.asp (500 words)

	OLC-65 Optical Level Controller
		The OLC-65 Optical Level Controller comprises a combined variable optical attenuator and a high-performance optical power meter function in a single, rugged, handheld instrument.
		Three operating modes including optical attenuator, optical power meter function, and automatic level controller.
		Sweep function features stable and repeatable automated test cycles for various attenuation values over time.
	www.acterna.com /global/products/descriptions/OLC-65 (101 words)

	Tektronix: Products > Optical Sources/Power Meter/Attenuator - TOP130 * TOP140 * TOP160 * TOP200 * TOP220 * TOP300 * TOP400: Introduction
		The optical connection is via the precision Universal Connector Interface (UCI) which offers superior repeatability, longevity and ease of maintenance.
		The Tektronix TOP130 Optical LED Source is a small, rugged LED source designed for use in installing, maintaining and researching LAN, FDDI and other fiber optic links.
		All optical connections are via the precision Universal Connector Interface (UCI) which offers low insertion loss, low return loss and excellent stability.
	www.tek.com /site/ps/0,,22-10648-INTRO_EN,00.html (695 words)

	Manual Variable Optical Attenuator MVOA
		Opneti MVOA features excellent optical characteristics over a wide wavelength range including low insertion loss, broad attenuation range, high resolution and high return loss with a compact metallic package.
	www.proconn.co.uk /opneti/manual-variable-optical-attenuator.html (49 words)

	Optogone - The Variable Optical Attenuator
		The Variable Optical Attenuator (VOA) is the first Optogone's products family.
		These all-fibered low cost VOA are based on a combination of in house mode expanding micro-optics and PDLC.
	www.optogone.com /products/voa.html (39 words)

	JDS MTA Series Price & Info at ASC
		This JDS Optical Attenuator cassette is used, and in excellent condition.
		This attenuator is controlled from the front panel keypad or by the GPIB remote interface.The commands are SCPI compatible, and...
		Surplus Optical, Scientific, and Electronic Test and Measurement Equipment
	www.artisan-scientific.com /48839.htm (468 words)

	Protodel Sets New World Standard With Variable Optical Attenuator Launch At OFC
		Its non-invasive, in-line Power Monitor is the only product of its type in the world and because it uniquely operates within the evanescent field of the optical transmission, it allows the optical signal to pass uninterrupted – giving record low loss and back reflection performance.
		It has been designed specifically to meet the increased optical power needs of the market and also the requirements of the ITU (International Telecommunications Union).
		Based on network designer feedback from the successful MkI & MkII devices, the Mark III is the only all-fibre attenuator to cover the crucial channel wavelength C, L and S bands in a single unit.
	www.pressbox.co.uk /Detailed/4486.html (1210 words)

	Eclipse(TM) Variable Optical Attenuator
		The PIMs enable modulation of an optical signal traveling over standard single mode fiber while simultaneously maintaining a specified level of attenuation.
		Measured at 3 dB attenuation with a 20V sinusoidal signal at 150 kHz.
		Depending on the specific application, the VOAs may be set to maintain an electronically adjustable value of either attenuation or output power.
	www.bostonati.com /p_voa.html (222 words)

	LIGHTCONNECT Introduces its Fast Variable Optical Attenuator Series 4000
		LIGHTCONNECT, a leading global supplier of dynamic components and modules for optical networks, expands its portfolio of MEMS-based Variable Optical Attenuators with its FVOA (Fast VOA) Series 4000.
		Designed for preventing system damage, the FVOA Series 4000 is ideally suited for receiver protection or for use as a safety switch during transmitter turn-up until the laser stabilises.
		This latest addition to LIGHTCONNECT's FVOA family of products is able to block the transmission of light when no voltage is applied and reduce the amount of attenuation as the applied voltage is increased.
	www.pressbox.co.uk /Detailed/6549.html (470 words)

	Kingfisher Handheld Variable Optical Attenuator. Singlemode / Multimode Optic Attenuators
		The KI 7010 Hand held Optical Variable Attenuator is a precision handheld variable attenuator commonly used in conjunction with a bit error rate tester, for optical margin evaluation on optical fiber networks.
		Other handheld fiber optic attenuator applications include measuring linearity and simulating fibre optic loss.
		Easy to use attenuators with >200hr battery life
	www.kingfisher.com.au /products/ki7010/7010.htm (92 words)

	Bitline System Pty Ltd - Variable Optical Attenuator
		Bitline System Pty Ltd - Variable Optical Attenuator
		The attenuation range is from 0 to 40 dB, and is continually adjustable.
		It features low insertion loss, large attenuation range, small package and easy to operate.
	www.myspecial.com.au /FiberOpt/2/VOA.asp (35 words)

	Optical Attenuator - Anritsu
		The MN924C and MN9605C are high-precision optical attenuators designed for use with single mode optical fibers.
		A combined step attenuator and continuous attenuator permit highly accurate attenuation adjustment.
		The MN9605C has PC-type optical connectors, so that internally reflected light is thoroughly suppressed.
	www.us.anritsu.com /products/ARO/North/Eng/showProd.aspx?ID=63&lc=Eng&cc=US&rc=ARO (113 words)

	Gemfire Expands PhotonIC Family Of Polymer Waveguide-Based Variable Optical Attenuator Arrays
		Gemfire announced that it has expanded its PhotonIC family of waveguide-based variable optical attenuator (VOA) arrays to include both 8-port and 16-port configurations as well as an 8-port VOA with blanking switch.
		Gemfire's VOA components are based on a siloxane-based polymer waveguide design and deliver enhanced functionality, integration and overall performance for gain equalization and dynamic saturation control of optical signals.
		The 8 and 16-port configurations are capable of delivering more than 20 dB of dynamic attenuation while consuming less than 20 mW per port of drive power.
	www.tmcnet.com/scripts/print-page.aspx?PagePrint=http://www.tmcnet.com/enews/032002h.htm (228 words)

	Fibre Technologies Ltd - Kingfisher (Fibre Identifier/Attenuator Testers)
		The KI 7010 Variable Optical Attenuator is a precision handheld variable attenuator commonly used for optical margin testing on optical fibre networks.
		Automated attenuator sequencing for high optical margin testing
		A visual fault finder is used as an optical fibre fault finder, fibre optic continuity tester, and cable fault locater over moderate distances.
	www.fibre.co.uk /products14.html (311 words)

	Laser Focus World - Lightconnect ships 40,000th variable optical attenuator
		Also today, Lightconnect announced that its latest product, the Fast Variable Optical Attenuator Series 5000 has successfully passed the reliability requirements listed in Telcordia GR-1209 and GR-1221.
		March 2, 2005, Newark, CA--Lightconnect announced today that it recently shipped its 40,000th variable optical attenuator (VOA) to a large optical system manufacturer.
		This was the last hurdle for the industry's smallest MEMS VOA before world-wide field deployment, Shah said, as several large system companies have already qualified this component in their systems.
	lfw.pennnet.com /Articles/Article_Display.cfm?ARTICLE_ID=222371&p=12 (182 words)

	Douglas Wong Wave Quad Monitored Variable Optical Attenuator Fiber Optic Module
		This 4 channel attenuator module uses VCB optical attenuators and includes 8 photodiodes for input and output optical power monitoring
		Quad Monitored Variable Optical Attenuator Fiber Optic Module
		My role was the Product Development Prime - supervising the team that developed the module.
	www.homepagez.com /dougwong/QMVCB.html (54 words)

	Variable Optical Attenuators - fiber optic attenuators, optical attenuators, fiber optic attenuator, singlemode variable optical attenuator, variable attenuator.
		Variable Optical Attenuators - fiber optic attenuators, optical attenuators, fiber optic attenuator, singlemode variable optical attenuator, variable attenuator.
		You Are Here: Top / Fiber Optic / Attenuators / Variable Optical Attenuators
		In-line Variable Optical Attenuator - ST Launch Singlemode
	www.lanshack.com /fiber_optic_attenuator_inline_variable_singlemode.asp (168 words)

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