WO2003027739A1 - Systeme optique reconfigurable a insertion-extraction a reseau de littrow - Google Patents

Systeme optique reconfigurable a insertion-extraction a reseau de littrow Download PDF

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Publication number
WO2003027739A1
WO2003027739A1 PCT/US2002/031219 US0231219W WO03027739A1 WO 2003027739 A1 WO2003027739 A1 WO 2003027739A1 US 0231219 W US0231219 W US 0231219W WO 03027739 A1 WO03027739 A1 WO 03027739A1
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WO
WIPO (PCT)
Prior art keywords
channel optical
switching system
channel
directing
optical signals
Prior art date
Application number
PCT/US2002/031219
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English (en)
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WO2003027739A8 (fr
Inventor
James P. Mcguire, Jr.
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Optical Research Associates
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Application filed by Optical Research Associates filed Critical Optical Research Associates
Priority to AU2002340076A priority Critical patent/AU2002340076A1/en
Publication of WO2003027739A1 publication Critical patent/WO2003027739A1/fr
Publication of WO2003027739A8 publication Critical patent/WO2003027739A8/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
    • G02B6/29305—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide
    • G02B6/29307—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide components assembled in or forming a solid transparent unitary block, e.g. for facilitating component alignment
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
    • G02B6/29305—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide
    • G02B6/2931—Diffractive element operating in reflection
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
    • G02B6/29305—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide
    • G02B6/29313—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide characterised by means for controlling the position or direction of light incident to or leaving the diffractive element, e.g. for varying the wavelength response
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
    • G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
    • G02B6/29382—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM including at least adding or dropping a signal, i.e. passing the majority of signals
    • G02B6/29383—Adding and dropping
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
    • G02B6/29395—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device configurable, e.g. tunable or reconfigurable
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
    • G02B6/2766—Manipulating the plane of polarisation from one input polarisation to another output polarisation, e.g. polarisation rotators, linear to circular polarisation converters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/351—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements
    • G02B6/3512—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements the optical element being reflective, e.g. mirror
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/354—Switching arrangements, i.e. number of input/output ports and interconnection types
    • G02B6/356—Switching arrangements, i.e. number of input/output ports and interconnection types in an optical cross-connect device, e.g. routing and switching aspects of interconnecting different paths propagating different wavelengths to (re)configure the various input and output links

Definitions

  • This invention relates to the field of optical communications, and more particularly, to a reconfigurable optical add/drop system for use in optical multiplexing.
  • WDM wavelength division multiplexing
  • Dividing bandwidth into multiple discreet channels, such as 4, 8, 16, 40, or even as many as 160 channels, through a technique referred to as dense channel wavelength division multiplexing (DWDM), is a relatively lower cost method of substantially increasing telecommunication capacity, using existing fiber optic transmission lines.
  • Techniques and devices are required, however, for multiplexing the different discreet carrier wavelengths. That is, the individual optical signals must be combined onto a common fiber-optic line or other optical waveguide and then later separated again into the individual signals or channels at the opposite end or other point along the fiber-optic cable.
  • the ability to effectively combine and then separate individual wavelengths (or wavelength sub-ranges) is of growing importance to the fiber-optic telecommunications field and other fields employing optical instruments.
  • Optical multiplexers are known for use in spectroscopic analysis equipment and for the combination or separation of optical signals in wavelength division multiplexed fiber-optic telecommunications systems.
  • Known devices for this purpose have employed, for example, diffraction gratings, prisms and various types of fixed or tunable filters.
  • Pan et al. US Pat. No. 5,652,814, Figure 25.
  • the WDM input signal is cascaded through individual filter assemblies, consisting of a fiber collimator, thin film filter, and a fiber focusing lens.
  • Each filter is set for a given wavelength.
  • aligning the fibers for each wavelength is costly and errors in the alignment contribute significantly to the system losses.
  • Figure 13 of Pan et al. teaches the use of a dual fiber collimator, thin film filter, and a dual fiber focusing lens to selectively DROP and ADD a single wavelength or range of wavelengths. As discussed above, aligning the collimators is expensive.
  • Polarization dependent loss is also a problem in WDM system because the polarization of the light drifts as it propagates through the fiber and furthermore this drift changes over time. Thus, if there is PDL in any component, the drifting polarization will change the signal level, which may degraded the system operation.
  • OADM optical add/drop multiplexers
  • Another OADM disclosed by Mizrahi US Pat. No. 6,185,023, employs fiber Bragg gratings to demux and mux signals in a WDM system. This method requires optical circulators and multiple components.
  • each multiplexers is designed and manufactured to mux (add) specific channels; or when used in reverse each multiplexers is also designed and manufactured to demux (drop) specific channels.
  • This limitation mandates that the optical system's parameters be fixed before installation. Changes are not possible without replacing the fixed optical multiplexers with different designed multiplexers. This is expensive.
  • Boisset et al International Publication No. WO01/13151.
  • the desired add/drop channel is programmed by translating a segmented filter. To achieve this translation however, a large mechanical mechanism is employed.
  • a further limitation to Boisset et al. is that only a single channel may be added or dropped per device.
  • Designers may employ multiple devices, deployed in series, and programmed as necessary to add/drop the correct channel; however, this approach requires multiple devices and has multiple points of failure. Furthermore, the size of such a device would be overly large and therefore not practical for many applications where space is limited.
  • OADMs Two other programmable OADMs are disclosed by Tomlinson, US Pat. No. 5,960,133, and Aksyuk, et al, US Pat. No. 6,204,946, both use bulk optics and gratings to demultiplex and multiplex WDM input and output signal. While OADM's disclosed by Tomlinson and Aksyuk are both programmable, neither provides for discrete adding or dropping of an individual optical signal in a multi signal system. To achieve discrete adding or dropping of an individual optical signal in a multi signal system using the systems disclosed in Tomlinson and Aksyuk, additional components are required. All the Add wavelengths must be multiplexed onto a single fiber before it is sent to the OADM. Likewise, a demultiplexer must be added to the Drop port to access the individual wavelength channels. The additional components require additional space, add attenuation, and add cost to the system.
  • a programmable Littrow grating based optical add/drop multiplexing device programmed to add and/or drop one or more optical channels from/to a multi-channel light signal, comprises a focal plane, in combination with a lens in combination with a prism, a Littrow grating, and a plurality of programmable mirrors.
  • the focal plane further comprises an IN port for receiving a multi-channel optical signal, a PASS port for transmitting a multi-channel optical signal, a plurality of ADD ports for receiving a plurality of optical channels, a plurality of DROP ports for transmitting a plurality of optical channels, and a plurality of programmable mirrors for directing light channels.
  • the multi-channel light enters the device by way of the IN port and is directed through the Lens to the Littrow grating, where selected channels are dispersed and directed through the lens and focused onto to the plurality of programmable mirrors.
  • the Littrow grating separates the multi-channel optical signal into its individual optical channels and directs the individual optical channels through the Prism, the Lens, and onto the programmable mirror that corresponds with that individual channel.
  • the channels are either directed through the lens, prism, and Littrow grating (or another wavelength separating medium) which combine the channels into a multi-channel light signal and directs it out of the system by way of the prism, lens and pass port, or the channels are directed through the lens, and mirror so as to exit the system by way of the Lens and one of the plurality of drop ports.
  • one or more channels may enter the device by way of one of the plurality of add ports, and are directed through the lens, mirror, and lens, to the one of the plurality of programmable mirrors so as to exit the system by way of the lens, prism, and Littrow grating, which combines the channels into a multi-channel light signal and directs it out of the system by way of the prism, lens and pass port.
  • a quarter-wave plate may also be employed between the Lens and Littrow grating.
  • the QWP rotates the polarization so that light that is s-polarized on the first pass is p-polarized on the second pass and there is no net polarization dependent loss (PDL) for light traveling between the IN and PASS ports.
  • Fig. 1 is a perspective view of a first embodiment of a Littrow grating based OADM detailing the various channel paths through the device.
  • Fig. 2 is a perspective view of the Focal Plane of the embodiment of Fig. 1.
  • Fig. 3 is a schematic view of a Focal Plane for an eight-channel embodiment of a Littrow grating based OADM.
  • Fig. 4 is a schematic side view of a MEMS mirror in IN/PASS and DROP/ADD modes.
  • Fig. 5 is a perspective view of the embodiment of Fig. 1 detailing the channel paths through the device for an PASS channel.
  • Fig. 6 is a perspective view of the embodiment of Fig. 1 detailing the channel paths through the device for an DROP channel.
  • Fig. 7 is a perspective view of the embodiment of Fig. 1 detailing the channel paths through the device for an ADD channel.
  • the Littrow grating based OADM of the invention has numerous applications, including use in fiber optic telecommunications systems.
  • Exemplary references to an optical channel, or simply to a channel, should be understood to mean an optical signal with a centered wavelength and an upper and lower wavelength. Channel spacing is measured from the center of the first channel to the center of an adjacent channel.
  • a three channel Littrow grating based OADM employing one embodiment of the invention, is detailed in Fig. 1. It is of note that while only three channels are used in this example, a substantially larger number of channels/ports may be employed.
  • the Littrow grating based OADM allows for demultiplexing and multiplexing separate optical channels onto or off of a multi-channel light signal.
  • the OADM of Fig. 1 may be dynamically programmed to demultiplex and multiplex any combination of channels onto or off the multi-channel light signal.
  • a first embodiment of the programmable OADM device of Fig. 1 comprises a focal plane 200 in combination with Lens 105, a prism 107, and a Littrow grating 109.
  • the device of Fig. 1 may be mounted within an enclosure optimized for optical transmission, including a gas-filled enclosure, or the like.
  • a Littrow grating is a grating that operates at or near Littrow.
  • the grating is used near the Littrow condition, so the same lens can be used for collimating and focusing the light. Further, using the grating near the Littrow condition takes advantage of the high diffraction efficiency of the grating near the Littrow condition.
  • Lens 105 may be comprised of multiple lens elements 105a, 105b and 105c. It is well known in the art that a lenses may be comprised of multiple lens elements to achieve a particular optical prescription. Prism 107 may optionally be used in any embodiment of the system.
  • Prism 107 may be used to minimize the thermal affects on Grating 109. When Prism 107 and Grating 109 are properly designed and configured the effects of temperature on the system are greatly reduced. However, some embodiments of the system do not contain Prism 107.
  • Quarter-wave plate (QWP) 103 may also be employed between the Lens and
  • the QWP 103 rotates the polarization so that light that is s-polarized on the first pass is p- polarized on the second pass and there is no net polarization dependent loss (PDL) for light traveling between the IN and PASS ports.
  • each DROP and ADD port is for a preassigned wavelength. All of these component are precisely aligned with each other, and mounted together so as to accommodate the entrance and exit of optical signals.
  • Fig. 3 Larger focal planes may be constructed and an eight channel system's focal plane is depicted in Fig. 3 comprising an IN port 301 for receiving a multi-channel optical signal 101 , a PASS port 303 for transmitting a multi-channel optical signal, a plurality of ADD ports 313, 323, 333, 343, 353, 363, 373, 383 for receiving a plurality of optical channels, a plurality of DROP ports 315, 325, 335, 345, 355, 365, 375, 385 for transmitting a plurality of optical channels, and a plurality of Programmable Mirrors 311 , 321 , 331 , 341 , 351 , 361 , 371 , 381 for directing light channels.
  • a multi-channel light signal 101 enters the device through the IN port 201 on the focal plane 200, and is directed through Lens 105.
  • the multi-channel light signal 101 is directed through the Lens 105, QWP 103, Prism 107, and Littrow grating 109.
  • the Littrow grating 109 diffracts the individual channels of the multi-channel light signal 101 (hereafter channels) towards the Lens 105, QWP 103, to the channel's associated Programmable Mirror 211 , 221 , or 231.
  • channels received via the IN port 201 are either passed via the PASS port 203 or dropped via one of the plurality of DROP ports 215, 225, or 235.
  • the channel(s) are directed through the Lens 105, QWP 103, Prism 107, and Littrow grating 109 which multiplexes the channel with other passed and added channels into a multi-channel light signal 111 and directs it out of the system by way of the Prism 107, QWP 103, Lens 105 and PASS port 203.
  • the channel(s) are directed through the Lens 105, and mirror 117 so as to exit the system by way of the Lens 105 and one of the plurality of DROP ports 215, 225, or 235 corresponding to the channel. Because the mirrors may be programmed individually, it will be clear to one skilled in the art that any channel may be dropped or passed.
  • one or more channels corresponding channels may enter the device through one of the plurality of ADD ports 213, 223, or 233.
  • These added channels enter the system by way of one of the plurality of ADD ports 213, 223, or 233, and are directed through the Lens 105 , Lens 105, mirror 117, Lens 105, to the one of the plurality of Programmable Mirrors corresponding to the channel so as to exit the system by way of the Lens 105, QWP 103, Prism 107, and Littrow grating 109, which multiplexes the channel with other passed and added channels into a multi-channel light signal 111 and directs it out of the system by way of the Prism 107, QWP 103, Lens 105 and PASS port 203.
  • the Programmable Mirrors 401 and 403 are constructed using Micro Electrical Mechanical Systems (MEMS). Programming of the Programmable Mirrors 401 and 403 is achieved by applying an electrical signal to the MEMS mirror.
  • the Programmable Mirror 401 is programmed to reflect the IN port to the PASS port.
  • the Programmable Mirror 403 is programmed to reflect the IN port to the DROP port, and to reflect the ADD port to the PASS port.
  • a larger mirror may be employed by design to control more then one channel. Of course, other types of mirror actuators could be used.
  • one or more separate channels may be dynamically routed onto or off of a multi-channel light signal. Further, by engaging the channel mirrors as a function of time and in synchronous conjunction with other system components, time-division multiplexing of optical signals may be achieved.
  • QWP quarter-wave plates
  • PDL polarization dependent loss
  • the preferred location of the QWP is between Lens 105 and Grating 109.
  • QWP may be positioned such that they are substantially normal to the propagating light beam and the retardance axis is at 45 degrees to the light that is polarized parallel and perpendicular to the grating graduations. Passage through the QWP converts the parallel and perpendicular polarized components of the light into right and left circularly polarized states. Reflection off the grating converts changes the handedness of the polarization: right circularly polarized light into left circularly polarized light and visa versa.
  • the multichannel light signal contains: channel one - which is to be passed via PASS port 203; channel two - which is to be dropped via DROP port 225; no channel three comes into the system; and a channel three is added via ADD port 233 and passed via PASS port 203.
  • Table 1 details the desired channel operation (i.e., PASS, DROP, ADD, etc.) for each channel, as well as the Programmable Mirror's state.
  • An optical prescription for a three channel Littrow grating based OADM is provided in Table 2 in CODE V format.
  • the numerical aperture of the lens is 0.17 to accommodate standard fiber and the grating has 600 Ip/mm.
  • the root mean square wavefront error is less than 0.03 waves in double pass over the temperature range of -20 to +70 degrees centigrade, when the mount is made of 416 Stainless Steel.
  • Fig. 5 and Fig. 2 the path of channel one of the three channel multi-channel collimated light signal 101 is more clearly illustrated.
  • channel one is to be received and PASSED by the system as follows.
  • the multi-channel light signal 101 enters the device through the IN port 201 and is directed through the Lens 105, Prism 107, and Littrow grating 109.
  • Littrow grating 109 demultiplexes the channels of the Multi-channel light signal 101 and diffracts channel one 501 through the Prism 107 and Lens 105 to Programmable Mirror 211.
  • the state of Programmable Mirror 211 is set to "IN to PASS" and therefore reflects channel one 501 through Lens 105, Prism 107 to Grating 109.
  • Grating 109 multiplexes channel one 501 with other passed and added channels into a multi-channel light signal 111 and directs multichannel light signal 111 out of the system by way of the Prism 107, Lens 105 and PASS port 203.
  • Fig. 6 and Fig. 2 the path of channel two of the three channel multi-channel collimated light signal 101 is more clearly illustrated. Recall that channel two is to be received and dropped by the system.
  • the multi-channel light signal 101 enters the device through the IN port 201 and is directed through the Lens 105, Prism 107, and Littrow grating 109.
  • Littrow grating 109 demultiplexes the channels of the Multi-channel light signal 101 and diffracts channel two 601 through the Prism 107 and Lens 105 to Programmable Mirror 221.
  • the state set to "IN to DROP" and therefore reflects channel two 601 through Lens 105, to Mirror 117.
  • Mirror 117 reflects channel two 601 out of the system by way of Lens 105 and DROP port 225.
  • Fig. 7 and Fig. 2 the path of channel three of the three channel multi-channel collimated light signal 101 is more clearly illustrated.
  • Channel three 701 enters the device through ADD 233 and is directed through the Lens 105, and Mirror 117.
  • Mirror 117 reflects channel three to Programmable Mirror 231 by way of Lens 105.
  • the state of Programmable Mirror 231 is set to "ADD to PASS" and therefore reflects channel three through Lens 105, Prism 107 to Grating 109.
  • Grating 109 multiplexes the channel with other passed and added channels into a multi-channel light signal 111 and directs multi-channel light signal 111 out of the system by way of the Prism 107, Lens 105 and PASS port 203.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un système de commutation optique multivoie pouvant notamment servir de multiplexeur à insertion-extraction programmable dans un système de télécommunication à longueurs d'onde multiples. Ce système de commutation utilise un réseau de Littrow (109) qui sépare un signal optique multivoie (101) en plusieurs voies optiques et combine plusieurs voies optiques en un signal optique multivoie. Ce système utilise également plusieurs ports optiques reliés au réseau (109) par voie optique et un dispositif de sélection permettant de déterminer quelle voie optique sera dirigée sur quel port optique.
PCT/US2002/031219 2001-09-28 2002-09-30 Systeme optique reconfigurable a insertion-extraction a reseau de littrow WO2003027739A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002340076A AU2002340076A1 (en) 2001-09-28 2002-09-30 Littrow grating based oadm

Applications Claiming Priority (4)

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US32567001P 2001-09-28 2001-09-28
US60/325,670 2001-09-28
US34996302P 2002-01-18 2002-01-18
US60/349,963 2002-01-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1503234A1 (fr) * 2003-07-31 2005-02-02 Corning Incorporated Modulateur spatial de lumière integré à réponse spectrale continue

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020131698A1 (en) * 2001-03-19 2002-09-19 Wilde Jeffrey P. Reconfigurable optical add and drop modules with servo control and dynamic spectral power management capabilities

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020131698A1 (en) * 2001-03-19 2002-09-19 Wilde Jeffrey P. Reconfigurable optical add and drop modules with servo control and dynamic spectral power management capabilities

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1503234A1 (fr) * 2003-07-31 2005-02-02 Corning Incorporated Modulateur spatial de lumière integré à réponse spectrale continue
US7187485B2 (en) 2003-07-31 2007-03-06 Corning Incorporated Integrated continuous spectrum spatial light modulator

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WO2003027739A8 (fr) 2004-05-21

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