GB2504970A - Optical device and methods to reduce cross-talk - Google Patents

Optical device and methods to reduce cross-talk Download PDF

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Publication number
GB2504970A
GB2504970A GB1214555.3A GB201214555A GB2504970A GB 2504970 A GB2504970 A GB 2504970A GB 201214555 A GB201214555 A GB 201214555A GB 2504970 A GB2504970 A GB 2504970A
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GB
United Kingdom
Prior art keywords
switch
plane
light
optical
spatially
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1214555.3A
Other versions
GB201214555D0 (en
Inventor
Melanie Holmes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thomas Swan and Co Ltd
Original Assignee
Thomas Swan and Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomas Swan and Co Ltd filed Critical Thomas Swan and Co Ltd
Priority to GB1214555.3A priority Critical patent/GB2504970A/en
Publication of GB201214555D0 publication Critical patent/GB201214555D0/en
Priority to EP13750928.7A priority patent/EP2885888A1/en
Priority to US14/421,694 priority patent/US10257594B2/en
Priority to PCT/GB2013/052174 priority patent/WO2014027204A1/en
Priority to GB1314627.9A priority patent/GB2506745A/en
Publication of GB2504970A publication Critical patent/GB2504970A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02F1/29—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 position or the direction of light beams, i.e. deflection
    • G02F1/31—Digital deflection, i.e. optical switching
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0003—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0009—Construction using wavelength filters

Abstract

A device and method for controlling light by wavelength dependent spatial filtering in a device 6000 with a switch plane (fig 12) and a dispersion plane (fig 13) using optics providing an imaging function in the dispersion plane, and a Fourier transform function in the switch plane, so as to enable crosstalk to be reduced.

Description

Field
The present disclosure concerns optical systems, device and methods. Some embodiments relate to optical switches, others to devices and methods of controlling light.
Background
Wavelength selective switches (hereinafter “WSS”) are now an established component in WDM - wavelength division multiplexing- networks. The main technologies are MEMS, LC and 2D LCOS, the latter being a two dimensional array of pixels implemented in a Liquid Crystal on Silicon device.
Prior to the first known WSS, Tomlinson describes a switch that acts like an independent crossbar switch for every wavelength: a single mirror is provided for each of the anticipated WDM channels at the main input to the device. A signal at a particular wavelength entering the main input or any of the add inputs, will be routed to the same mirror. If this mirror is set to the express state, the signal for the corresponding channel entering the main input will be routed to the main (express) output: what happens to any signal at the same wavelength entering the add input(s), depends on how the switch is arranged. If this mirror is set to the "add state", the signal entering the add input will be routed to the express output, while the signal entering the main input will be routed to the drop port. The device may have more than one pair of add/drop ports so configured. Although this generic architecture could easily be developed to include channel equalisation, it has two fundamental problems. Firstly, the add and drop routing configurations are not independent, secondly, any channel equalisation applied to an added signal, would automatically be added to a dropped signal. These two constraints make the device impractical for use in a real network.
The first known WSS patent was from Capella. In this architecture, separate modules are used to add and drop signals: hence the control is independent. The provisional application (March 2001) US 60/277,217 described a switch with an individual MEMS mirror per wavelength channel, aligned dynamically with a servo mechanism to the incident beam, providing "dynamic drop of one or more wavelength channels on any one of multiple drop ports", which At this point techniques commonly used to control crosstalk in optical switches using LCOS become a design bottleneck. They also add control complexity, operating costs and manufacturing overheads. Further, "modular" innovation is required, introducing new design paradigms to overcome these problems.
An LCOS array used in a WSS operates by controlling the physical direction of optical beams that travel through the switch. These optical beams have a start location at a switch input, and a destination location at a switch output. Therefore the physical route taken by each beam defines an optical pathway through the switch.
An LCOS WSS operates by forming optical pathways, (sometimes referred to as “switch channels”) through the switch and distributing incident light by wavelength into those pathways. The incoming light is typically angularly dispersed by wavelength onto a LCOS SLM. The light modulating elements (sometimes referred to as “pixels”) of the LCOS SLM are grouped together, and each group is assigned to a wavelength of light. In practice, incoming light to the LCOS WSS is unlikely to be a set of purely monochromatic wavelengths. It is instead likely that each nominal wavelength will in fact consist of a range of wavelengths; for any nominal wavelength this range will be spread across the light modulating elements of the relevant group, again spatially spread by frequency.
Each switch channel has a filter function which corresponds to the relationship between the light at the switch input and at the switch output when broadband light is applied. Then when a transmission channel is applied to the input, concatenation of the filter function with the transmission channel, creates the channel spectrum at the output.
The filter function can be derived mathematically by decomposing or measuring the distribution of the monochromatic frequency components of input broadband light by wavelength across each group of pixels as a frequency-dependent summation of spots of In a further aspect, there is provided an improved method for reducing crosstalk in an optical switching device, the method comprising selectively blocking at least one wavelength from an input port, passing other wavelengths on to a routing device and routing the other wavelengths.
In a still further aspect, there is provided a method of reducing crosstalk in an optical switching device, illuminating a group of light modulating elements to provide plural diffraction orders, spatially distributing at least some of the diffraction orders onto a spatial light modulator and blocking unwanted orders.
In a yet further aspect, there is provided an optical switch comprising a dispersion device configured to disperse incoming light by wavelength onto a first LCOS array, the first LCOS array being controllable to spatially filter light incident upon it, means defining an optical path to cause light passed by the first LCOS array to become incident upon a second LCOS array, the second LCOS array being controllable to route light incident upon it in desired directions, the dispersion device being arranged to collect light for outputs of the switch.
In a related aspect, there is provided an optical switch comprising a dispersion device configured to disperse incoming light by wavelength onto a first LCOS array, the first LCOS array being controllable to route light incident upon it in desired directions, means defining an optical path to cause light passed by the first LCOS array to become incident upon a second LCOS array, the second LCOS array being controllable to spatially filter light incident upon it, the dispersion device being arranged to collect light from the second LCOS array for the output of the switch.
In yet another aspect, there is disclosed a method of attenuating an optical signal by segmenting a group of pixels onto which the signal is incident.
In still another aspect, there is disclosed a method of reducing crosstalk using more than one LCOS array. Ligs 14 and 15 show an embodiment of the intermediate optics 1104 together with the first LCOS array 1103 and the second LCOS array 1105, and part of the output optics 1102. Intermediate optics 1104 delivers the processed beams at the selected wavelengths from the first LCOS array 1103 to the second LCOS array 1105, which may be part of the same or a different LCOS backplane device. Lig. 14 shows a cross-section in the switch plane while Lig. 15 shows a cross section in the dispersion plane.
With reference to Figs 14 and 15, the optics shown consists of the first LCOS array 1103 and the second LCOS array 1105, together with the cylindrical dispersion lens 1211 that is disposed to receive light from the first LCOS array 1103. Light after passing through this lens strikes an optical device 1402 that acts as a tilted cylindrical mirror in the switch plane but as a retroreflector in the dispersion plane. This optical device 1402 is configured and arranged so as to reflect light from the first LCOS array 1103 on to the second LCOS array 1105 via The light processed by the first LCOS array 1103 is in the form of two polarisation components as sets of pairs of angularly separated beams 1401, one pair for each of the N input ports. The figure shows the chief rays for each pair 1404 and 1405 of polarisation components for the extreme ports. The angularly-separated beams propagate towards the optical element 1402 to act as a Fourier element creating two spatially separated sets of beams that travel up to reach the second LCOS array 1105. Hence the beams at the second LCOS array 1105 are separated according to their original polarisation state, so may be attenuated to compensate for polarisation dependent loss, PDL. Also as shown in the figure, the angle of incidence at the second LCOS array 1105, depends on the input port, but is substantially the same for both polarisation components from the same input port. The LCOS arrays 1103 and 1105 should ideally be at the focal plane of the cylindrical mirror. From the geometry in the figure, this is not exactly possible unless the beam tilt required to reflect light between the two LCOS arrays is created elsewhere in the system, rather than at the cylindrical mirror, as would be clear to a skilled optical layout designer. Aberrations in the switch plane may be corrected by phase compensation at the second LCOS SLM, 1105.
The second LCOS array 1105 applies routing holograms to route the processed beams from the first LCOS array 1103 to the output optics 1102 at the desired angle to couple into the output. The second LCOS array 1105 may also apply attenuation methods to create the desired attenuation spectrum. While propagating from the first LCOS array 1103 to the second LCOS array 1105, the beams pass twice through the cylindrical dispersion element 1211 which does not have focusing power in the switch plane, shown in Fig. 14. While propagating from the second LCOS array 1105 to the output optics 1102, the beams reach the dispersion element 1310.
If the LCOS arrays are physically separate devices, ie two separate SLMs, the alignment direction of the liquid crystal can be optimised independently for the two devices. However, if a common device, as is desirable to reduce manufacturing costs, it is likely that the liquid

Claims (8)

1. A switch device having means for spatially modulating light, a dispersion device for spatially dispersing light onto the means for spatially modulating light the switch device having a switch plane and a dispersion plane, and anamorphic optics providing an imaging function in the dispersion plane, and a Fourier transform function in the switch plane.
2. A switch device according to claim 1 wherein the means for spatially modulating light has a first portion for spatially filtering light and a second portion for routing light.
3. A switch device according to claim 1 or 2, wherein the means for spatially modulating light comprises an LCOS SLM
4. A method of controlling light using a spatial filter means and a routing means in a switch having a dispersion plane and a switching plane, the method comprising using anamorphic optics to perform an imaging function in the dispersion plane and to perform an a Fourier transform function in the switching plane .
5. An optical switch having an input, a switching stage, and an output, wherein the switch is adapted to receive at its input plural optical signals of different wavelengths, the switching stage comprising a first electrically controllable portion for selectively blocking at least one of the wavelengths, and a second electrically controllable portion for routing output wavelengths of the first stage to the switch output.
6. An optical switch according to claim 5, wherein the electrically controllable first portion is configured to spatially filter inputs by wavelength.
7. An optical switch according to claim 5 or 6, adapted to receive an ensemble of optical wavelengths.
8. An optical switch according to claim 5, 6 or 7, having plural input ports and a single output port.
GB1214555.3A 2012-08-15 2012-08-15 Optical device and methods to reduce cross-talk Withdrawn GB2504970A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB1214555.3A GB2504970A (en) 2012-08-15 2012-08-15 Optical device and methods to reduce cross-talk
EP13750928.7A EP2885888A1 (en) 2012-08-15 2013-08-15 Optical device and methods
US14/421,694 US10257594B2 (en) 2012-08-15 2013-08-15 Optical device and methods
PCT/GB2013/052174 WO2014027204A1 (en) 2012-08-15 2013-08-15 Optical device and methods
GB1314627.9A GB2506745A (en) 2012-08-15 2013-08-15 Optical device and methods

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1214555.3A GB2504970A (en) 2012-08-15 2012-08-15 Optical device and methods to reduce cross-talk

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GB201214555D0 GB201214555D0 (en) 2012-09-26
GB2504970A true GB2504970A (en) 2014-02-19

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GB1314627.9A Withdrawn GB2506745A (en) 2012-08-15 2013-08-15 Optical device and methods

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US (1) US10257594B2 (en)
EP (1) EP2885888A1 (en)
GB (2) GB2504970A (en)
WO (1) WO2014027204A1 (en)

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