USRE37044E1 - Tunable add/drop optical filter - Google Patents
Tunable add/drop optical filter Download PDFInfo
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- USRE37044E1 USRE37044E1 US09/257,555 US25755599A USRE37044E US RE37044 E1 USRE37044 E1 US RE37044E1 US 25755599 A US25755599 A US 25755599A US RE37044 E USRE37044 E US RE37044E
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- 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
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- G02B6/2713—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 cascade of polarisation selective or adjusting operations
- G02B6/272—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 cascade of polarisation selective or adjusting operations comprising polarisation means for beam splitting and combining
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- 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
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- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
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- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
- H04J14/0212—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] using optical switches or wavelength selective switches [WSS]
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- 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
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- 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
- G02B6/2773—Polarisation splitting or combining
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
Definitions
- a tunable add/drop filter for the wavelength-division-multiplexing (WDM) network applications is described.
- This filter can add or drop part of the high transmission capacity signals of a WDM link.
- the communication environment is evolving towards increasingly heterogeneous but interconnected networks.
- the growth of demand for existing services and the introduction of new advanced services is expected to create a large increase of traffic flow in the near future.
- the current evolution of telecommunication network is led by asynchronous and synchronous transfer modes (Asynchronous Transfer Mode(ATM), Synchronous Optical Network (SONET), Synchronous Digital Hierarchy (SDH)), which require primarily electronic technologies for processing and switching.
- ATM Asynchronous Transfer Mode
- SONET Synchronous Optical Network
- SDH Synchronous Digital Hierarchy
- the necessary hardware building blocks are available to design wide area networks, complex issue arises with issues arise with the management of network resources.
- the layer structure of the transport network and the use of optical means are preferred.
- This invention describes a tunable optical add/drop filter for the optical WDM network application.
- This filter can add or drop part of the high transmission capacity signals of a WDM link. It can be used to decentralized access point decentralize access points in the access network or as a small core network node to in realizing branching points in the network topology. It works in both wavelength and space domains.
- the first structure [Cheung, “Acoustoopic Tunable Filters in Narrowband WDM networks: System Issues and Network Applications,” IEEE J. Sele. Area Comm. 8(6), 1015, 1990.] uses four 1 ⁇ N demultiplexers and N's 2 ⁇ 2 optical switches. The structure is complicated and the interconnections are difficult.
- the second tunable add/drop filter similar to the first geometry, has recently been proposed and demonstrated by Glance at AT&T. [Glance, “Tunable add/drop optical filter providing arbitrary channel arrangement”, IEEE Photon. Lett., 7(11), 1303, 1995 and U.S. Pat. No. 5,488,500.]
- This filter provides the advantage of arbitrary channel arrangement, but still suffers a costly 6 dB optical coupling loss, because of the two array waveguide grating demultiplexers used in the structure.
- the third type of wavelength-space switch [Dono et al, “A wavelength division multiple access network for computer communication”, IEEE J. Sol. Area Comm., 8(6), 983, 1990.] has been widely used in various WDM networks, for example the IBM Rainbow Network.
- This structure uses a passive star-coupler that combines and splits the incoming light signals into N receivers. The receivers built with a tunable filter then select the desired channels. It has the broadcast capability and the control structure of this implementation is very simple.
- the undesirable feature of the broadcast star the splitting loss can be very high when the users number is large.
- an undesirable feature of the broadcast star is that splitting losses can be very high when the number of users is large.
- the add/drop filter presented in this invention can re-route the unused channels, which are rejected by the tunable filter, back to the network and save the precious optical energy in the network. It includes the design of an optical isolator, that also dramatically cuts down the return loss of the device, another important performance requirement for high-speed WDM devices. It operates in both wavelength and space domains that provides hybrid functionality with a relatively simple structure. It is ideal for the WDM applications.
- FIGS. 1 a, 1 b are the building blocks of a tunable add/drop optical filter of this invention. It consists of three primary parts of non-reciprocal optical setup, tunable filter, and reciprocal optical setup.
- FIG. 2 is a schematic representation of an exemplary tunable add/drop filter of this invention.
- FIG. 4 is a structure representation of an exemplary tunable add/drop filter of this invention which incorporates a liquid crystal Fabry-Perot tunable filter.
- a pair of half waveplates are added into the two light paths, respectively, to rotate the polarizations match to the optical axis to the liquid crystal Fabry-Perot tunable filter.
- FIG. 5 is a schematic representation of a multi-port add/drop tunable filter.
- the input/output ports have multiple fibers that carry the optical signals from multiple WDM networks.
- Each add/drop layer can independently drop or add a desired optical frequency through the sectioned tunable filter.
- FIGS. 6 a, 6 b, 6 c show optical switches combined with tunable add/drop filters to form tunable multiple-port add/drop filters.
- the present invention includes a tunable add/drop filter that utilizes the unique operational characteristics of a non-reciprocal optical setup and a reciprocal optical setup for wavelength re-routing, and a tunable filter for wavelength selection.
- the non-reciprocal optical setup provides the functionality for optical channels to go in and out of the filter with high isolation.
- the reciprocal optical setup is used to keep the light were paths stay the same during the add/drop operations.
- a filter is inserted to select the desired channels that pass through the add/drop filter.
- the non-reciprocal optical setup may comprise of a Faraday Rotator, a birefringent element, a polarizing beam combiner, and a right angle prism.
- the reciprocal optical setup may comprises of comprise a pair of birefringent elements with their polarization eigen plane planes orthogonal to each other and are ⁇ 45° to that of the birefringent element in the non-reciprocal setup, respectively.
- the core of this tunable add/drop filter composes of a comprises a tunable filter 55 , a non-reciprocal optical return setup 54 , and a reciprocal optical setup 56 , as shown in FIG. 1 .
- the spectra changed in the filter can be understood from 700 and 701 for the adding and dropping operations, respectively.
- 700 adding operation (FIG. 1 a )
- the channel (wavelength) to be added into the WDM network is in 711 and enters from 52 . It combines with the spectrum 712 , which already exists in the network, and exit exits at 53 with a combined spectrum 713 .
- dropping operation 701 (FIG. 1 b )
- the network spectrum is 722 . It drops part of the spectrum 721 to 52 .
- the rest of the returned channels then re-routes re- route through 53 and go back to the network with a spectrum 723 .
- the light wave propagates propagation within the add/drop filter can be further explained as follow follows.
- the incoming network signals carry carrying multiple wavelengths enter from port 51 .
- the non-reciprocal optical setup 54 passes spectrum 722 to the tunable filter 55 .
- the selected channel 721 passes through the filter and the reciprocal setup 56 , and exit exits at port 52 .
- the rejected channels by the tunable filter reflects reflect back to the non-reciprocal setup 54 . Because of the non-reciprocal property of 54 , light propagates backward in a different path as in from the forward propagating direction path. Therefore, it exits at port 53 and completes the dropping operation.
- optical signal 711 to be added into the network enters from port 52 . Because of the reciprocal setup of 56 , light traveling in the reverse direction follows exactly the same path as it did in the forward direction. Therefore, spectrum 711 passes through the filter 55 that has been tuned to the channel and enters the non-reciprocal setup 54 . Because of the non-reciprocal optical path arrangement, this added channel joins the rest of the rejected channels rejected by the filter in the backward propagating direction and exits at port 53 . This completes the adding operations.
- FIG. 2 A preferred structure of this invention is shown in FIG. 2 .
- the non-reciprocal setup is built by a combination of a Faraday rotator 25 , a birefringent element 21 , a polarization beam combiner 15 , and a right angle prism 14 .
- the optical reciprocal setup is comprised of a pair of birefringent elements 22 / 23 with their polarization eigen planes 212 / 213 perpendicular to each other, and are ⁇ 45° relative to the polarization eigen plane 211 of the birefringent element in the non-reciprocal setup.
- the polarization eigen plane is defined by the plane that contains the optical axis of the birefringent element and also is the plane that contains the two orthogonal polarization states, when an unpolarized light is incident onto the element.
- the add/drop channel is selected by the tunable filter 26 .
- the add/drop port is designated by 12 .
- the input and output ports to the WDM network are 11 and 13 .
- FIG. 3 is the top view of the device.
- the polarization progression within the filter is also indicated.
- FIG. 3 a the forward dropping operation is realized by splitting the input polarization into two eigen orthogonal polarizations using the birefringent element 21 . These two light beams with polarization at (0°, 90°) are then rotated another 45° by the Faraday Rotator 25 which sits inside a magnet 29 and incident onto the filter 26 .
- the dropping channel passes through tunable filter 26 where it has been tuned to the desired resonant condition.
- the channels (wavelengths) that are rejected by the tunable filter 26 they backward propagate to 25 and are rotated another 45°. Because this is a non-reciprocal effect, the returned polarizations are in (90°, 0°) states and are orthogonal to their original input states. Hence, they travel at different paths when passing through 21 , as shown in FIG. 3 b. These two light beams are recombined by the right angle prism 14 and the polarization beam combiner 15 and send back to the WDM network.
- the added operation can be traced as shown in FIG. 3 b.
- the light signal to be added into the WDM network first splits its polarization by 22 and 23 combination with polarization angles of (+45°, ⁇ 45°). This is based on the fact that the input and output of the combined elements ( 22 and 23 ) are reciprocal. This means that light traveling in the reverse direction (i.e. the adding operation) must follow exactly the same path as it does in the forward direction. Therefore, at the exit of this the combined birefringent element ( 22 / 23 ), the spatial walk-off and the polarizations are identical for both forward and backward traveling light waves. With filter 26 tuned to the added wavelength, light signal passes the filter and enters 25 .
- the Faraday rotator can be those based on magneto-optic materials, for examples, yttrium iron garnet (YIG), bismuth-substituted rare earth iron garnet (RBilG), and holmium and terbium doped garnet crystals (HoTbBi)lG.
- the filter in this invention can be, piezo-tuned Fabry-Perot optical filters, liquid-crystal based Fabry-Perot tunable filters (U.S. Pat. No. 5,111,321, by Patel), tunable polarization interference filters (A.
- the polarizing materials used for the reciprocal operation can be materials with optical anisotropy, for examples calcite, rutile, lithium niobate (LiNbO 3 ), and yttrium orthovanadate YVO 4 . All these Faraday rotators, filters, and polarizing crystals are commercially available.
- An example of the tunable add/drop filter can be realized by using a liquid-crystal Fabry-Perot tunable filter as shown in FIG. 4.
- a pair of halfwave plates are inserted in front of and behind of the liquid crystal filter.
- the first wave plate 27 is added into the light path 800 to change the polarization of the decomposed input light to match the 45° optic axis of the filter 99 .
- the second halfwave plate 28 which is placed on the opposite side of the filter, rotates the extra-ordinary light wave into ordinary in light paths 801 .
- the two then recombines recombine by the birefringent elements 22 and 23 .
- the rest of the operations are explained in the previous embodiment.
- this multi-port add/drop tunable filter can be realized based on the current structure. As shown in FIG. 5, this multi-port add/drop tunable filter can be easily fabricated by patterning a liquid-crystal Fabry-Perot filter into sections, and spatially aligning a series of inputs and outputs ports together.
- this multi-port tunable add/drop filter has exactly the same number of birefringent elements, Faraday rotator, and filter as in the single-port design.
- the patterning of the liquid-crystal Fabry-Perot can also be achieved photolithographically on the controlling transparent indium-tin-oxide (ITO) electrodes. Therefore, costs saving on materials and a compact packaging are possible for this multi-port filter.
- Potential applications include, but not limit to, are not limited to multiple WDM networks interconnections where simultaneously simultaneous performances of add/drop channels at this filter node can be achieved.
- a high throughput passive add/drop filter is realized.
- the add/drop channel is pre-defined by the interference filter. However, only such a wavelength can go in and out of the ports.
- the three-port add/drop filter becomes a four-port add/drop filter with it's input- and output-port separated.
- Two of this these add/drop filters 811 can be further interconnected to form a wavelength-space switching node for multi-layered WDM systems.
- one of the add/drop port ports 823 of the each of the add/drop filter 811 is linked to the each other filters 811 are linked together.
- the channels between the two WDM systems 801 and 802 can then be shared through this interconnected optical node.
- optical channels can still be loaded up and down from the its WDM network 801 and 802 , respectively. This greatly increase increases the flexibility design from the system's perspective.
- This tunable add/drop filter can be regarded as a combination of a tunable filter and an optical circulator. It has the merits of:
- the tunable filter is a liquid-crystal Fabry-Perot type
- multiple-port add/drop tunable filters can be realized by patterning the liquid-crystal Fabry-Perot filter into sections and spatially aligning an array of input and output fibers together. With the output ports connected to an N ⁇ N switch, a space-separated, wavelength-division demultiplexer can be realized.
- This multiple-port add/drop tunable filter can potentially be used to link multi-WDM networks without complicated electrooptic conversion at each networking node.
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Abstract
Description
Claims (30)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/257,555 USRE37044E1 (en) | 1996-04-10 | 1999-02-23 | Tunable add/drop optical filter |
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US08/629,523 US5606439A (en) | 1996-04-10 | 1996-04-10 | Tunable add/drop optical filter |
US09/257,555 USRE37044E1 (en) | 1996-04-10 | 1999-02-23 | Tunable add/drop optical filter |
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US08/629,523 Reissue US5606439A (en) | 1996-04-10 | 1996-04-10 | Tunable add/drop optical filter |
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US09/257,555 Expired - Lifetime USRE37044E1 (en) | 1996-04-10 | 1999-02-23 | Tunable add/drop optical filter |
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US08/629,523 Ceased US5606439A (en) | 1996-04-10 | 1996-04-10 | Tunable add/drop optical filter |
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