WO2016122464A1 - Commutateurs à résonateurs à micro-anneau accordables - Google Patents

Commutateurs à résonateurs à micro-anneau accordables Download PDF

Info

Publication number
WO2016122464A1
WO2016122464A1 PCT/US2015/013125 US2015013125W WO2016122464A1 WO 2016122464 A1 WO2016122464 A1 WO 2016122464A1 US 2015013125 W US2015013125 W US 2015013125W WO 2016122464 A1 WO2016122464 A1 WO 2016122464A1
Authority
WO
WIPO (PCT)
Prior art keywords
waveguide
wavelength
microring
signal
quadrant
Prior art date
Application number
PCT/US2015/013125
Other languages
English (en)
Inventor
Sagi Varghese MATHAI
Michael Renne Ty Tan
Wayne V SORIN
Joaquin MATRES
Original Assignee
Hewlett Packard Enterprise Development Lp
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 Hewlett Packard Enterprise Development Lp filed Critical Hewlett Packard Enterprise Development Lp
Priority to PCT/US2015/013125 priority Critical patent/WO2016122464A1/fr
Publication of WO2016122464A1 publication Critical patent/WO2016122464A1/fr

Links

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
    • G02B6/28—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
    • G02B6/29331—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 evanescent wave coupling
    • G02B6/29335—Evanescent coupling to a resonator cavity, i.e. between a waveguide mode and a resonant mode of the cavity
    • G02B6/29338—Loop resonators
    • G02B6/29343—Cascade of loop resonators
    • 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
    • G02F1/01—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 
    • G02F1/21—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  by interference
    • G02F1/225—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  by interference in an optical waveguide structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/58—Multi-wavelength, e.g. operation of the device at a plurality of wavelengths
    • G02F2203/585—Add/drop devices

Definitions

  • a microring resonator is a waveguide formed in a dosed loop.
  • Light can be evanescentiy coupled from a second waveguide placed close to the microring resonator.
  • opticai power from the second waveguide develops as a traveling wave in the resonator.
  • light propagating at non-resonant wavelengths in the second waveguide continues to propagate with no coupling effect to the resonator.
  • the resonant wavelength of the resonator can be tuned by changing the effective refractive index of the waveguide.
  • FIG. 1A depicts a diagram of an example switch building block that includes a set of four microring resonators.
  • FIG. 1B depicts example spectral responses of signals transmitted to and dropped from a port of the switch building block.
  • FIG. 2A depicts a diagram of example parallel cascaded resonators.
  • FIG. 2B depicis example optical filter responses of parallel cascaded resonators
  • FIG. 3 depicts a diagram of example series cascaded resonators.
  • FIG. 4B depicts example input spectra and signals dropped to the output ports of two serially cascaded switch building blocks.
  • FIG. 4C depicts a diagram of four serially cascaded switch building blocks.
  • FIG 4D depicis example input spectra and waveiength signals dropped from the output ports of four serially cascaded switch building blocks.
  • FIG. 5A depicts an example 2x2 cyclic crossbar switch
  • FIG. 5B depicts an example 4x4 cyclic crossbar switch.
  • FIG. 6A depicts a diagram of an example switch building block with photodetectors that tap Sight power from microring resonators.
  • FIG. 8B depicts a diagram of an example switch building block with integrated photodetectors.
  • FIGS. 7A and 7B depict a 2x2 cyclic crossbar switch with example time- shared photodetectors
  • FIG. 8 depicts a flow diagram illustrating an example process of tuning microring resonators of a switch building block to transmit and drop a first signal.
  • FIGS. 9A and 9B depict a flow diagram illustrating an example process of tuning microring resonators of a switch building block to transmit and drop a first and a second signal, and to calibrate the microring resonators.
  • FIG. 10 depicts a flow diagram: illustrating an example process of using a switch building block to transmit an additional signal in a waveguide with the first signal.
  • FIGS. 1 1A and 1 1 B depict a flow diagram illustrating an example process of using a 2x2 cyclic crossbar switch.
  • FIG, 12 depicts nomenclature for directions of signals propagating through a 2x2 cyclic crossbar switch.
  • WDM wavelength-division multiplexing
  • multiple signals at different wavelengths are joined and transmitted along an optical waveguide to increase the transmission capacity of the system.
  • the joined signals may not have the same destination in the optical system, and some signals at certain wavelengths may be switched to another optical waveguide with a different destination, it would be beneficia! to be able to select signals at particular wavelengths for switching.
  • the techniques below describe a microring resonator- based optical switch that can selectively switch wavelengths between waveguides.
  • FIG. 1A depicts a diagram of an example switch building block 100 that includes a set of four microring resonators 101-104.
  • the switch building block 100 is a 4-port device that includes a first waveguide 1 10 and a second waveguide 11 1 that crosses the first waveguide at a first crossing point 15, The first crossing point 115 is where the first and second waveguides 1 10, 11 1 intersect. This region may be designed to minimize losses experienced by signals that propagate through the intersection.
  • the first waveguide 1 10 and the second waveguide 1 11 are shown to intersect at right angles in the figures, the waveguides may intersect at any angle.
  • [00173 T ne switch building block 100 also includes a first set of four tunable microring resonators 101 -104 positioned near the first crossing point 1 15.
  • compass directional points may be used to identify directions relative to the first waveguide 1 10 and the second waveguide 11 1 , although the switch building block 100 may be oriented in any direction.
  • a first signal at a first wavelength ⁇ -s propagating from east to west in the first waveguide 110 may be referred to as propagating in a first direction.
  • a second signal at a second wavelength Xi propagating from west to east in the first waveguide 110 may be referred to as propagating in a second direction.
  • Signals dropped from the first waveguide 1 10 to the second waveguide 1 1 that propagate from the south toward the north may be referred to as propagating in a third direction, and dropped signals that propagate from the north toward the south may be referred to as propagating in a fourth direction.
  • Signals may be input from either end of the first waveguide 110.
  • the end of the first waveguide 1 10 in the west may be referred to as the west input port, and the end of the first waveguide 1 10 in the east may be referred to as the east input port.
  • the end of second waveguide 111 in the north may be referred to as the north output port, and the end of the second waveguide 111 in the south may be referred to as the south output port.
  • microring resonator 1 101 is coupled to the first and second waveguides 110, 111 ; in the northwest quadrant, referred to as the second quadrant, microring resonator 2 102 is coupled to the first and second waveguides 1 0, 1 1 ; in the southwest quadrant, referred to as the third quadrant, microring resonator 3 103 is coupled to the first and second waveguides 1 10, 11 1 ; and in the southeast quadrant, referred to as the fourth quadrant, microring resonator 4 104 is coupled to the first and second waveguides 1 10, 1 1 1.
  • a microring resonator may be referred to as being on when the resonator's resonant wavelength is tuned to the wavelength of a signal of interest, and the resonator may be referred to as being off when the resonator's resonant wavelength is tuned away from the wavelength of the signal of interest. For example, if a signal having a wavelength ⁇ 3 ⁇ 4 is transmitted in the first direction from east to west in the first waveguide 1 10, and resonator 1 101 and resonator 4 104 are both off relative to wavelength ⁇ , the signal propagates unaffected through the first waveguide 110 to exit at the west port of the first waveguide 1 10.
  • the signal in the first waveguide 1 10 couples to resonator 1 101 and is dropped in the third direction toward the north in the second waveguide 1 1 .
  • the signal couples to resonator 4 104 and is dropped in the fourth direction toward the south in the second waveguide 11 1. If both resonator 1 101 and resonator 4 104 are on relative to wavelength ⁇ , the signal is split and one portion is dropped in the third direction, and another portion is dropped in the fourth direction.
  • the power splitting ratio between the third and fourth directions may be controlled by resonator 1 101 and resonator 4 104.
  • the resonant wavelengths of resonator 1 101 and resonator 4 104 may be different. For example, if the resonant wavelength of resonator 1 101 is A, and the resonant waveiength of resonator 4 104 Is B, a signal at wavelength A propagating in the first direction is dropped in the third direction, while a signal at waveiength B propagating in the first direction is dropped in the fourth direction.
  • a first micronng resonator in a first quadrant and a fourth micronng resonator in a fourth quadrant may be tuned to resonance at a first wavelength to selectively switch signals at the first wavelength from the first waveguide to the second waveguide.
  • a second microring resonator in a second quadrant and a third microring resonator in a third quadrant may be tuned to resonance at a second wavelength to selectively switch signals at the second wavelength from the first waveguide to the second waveguide,
  • IOO233 As another example, if a signal having a wavelength ? cheese2 is transmitted in the second direction from west to east in the first waveguide 110, and resonator 2
  • resonator 2 102 and resonator 3 103 are off relative to wavelength ⁇ 2 , the signal propagates unaffected through the first waveguide 1 10 to the east port of the first waveguide 110. However, if resonator 2 102 is on relative to wavelength hi, and resonator 3
  • the signal couples to resonator 2 102 and is dropped in the third direction toward the north in the second waveguide 1 1 1.
  • the signal couples to resonator 3 103 and is dropped In the fourth direction toward the south in the second waveguide 1 1 1 .
  • FIG. 1B depicts example speciral responses of signals transmitted to and dropped from a port of the switch building block.
  • the example through port spectrum for a signai traveling in the first direction has notch-shaped characteristics at the wavelength ⁇ ⁇ . corresponding to the resonant wavelength of resonator 1 101 , and at the wavelength AB, corresponding to the resonant wavelength of resonator 4 104.
  • Notch-shaped characteristics are also located at free spectra! range intervals of these wavelengths.
  • the drop port spectrum for signals propagating toward the north is compiementary to the through port spectrum at the resonant wavelength ⁇ , ⁇ and at FSR intervals of ⁇ /
  • the bottom graph of FIG.. 1 B shows the drop port spectrum for signals propagating toward the south, complementary to the through port spectrum at the resonant wavelength XB and at FSR intervals of B.
  • a set of four microring resonators in a switch building block configuration may be tuned to 16 different states.
  • the example where resonator 1 101 and resonator 4 104 have the same resonant wavelength ⁇ , and resonator 2 102 and resonator 3 103 have the same resonant wavelength ⁇ 3 ⁇ 4 ⁇ is discussed here.
  • ali four resonators are off, propagating signals in either direction of the first waveguide 110 pass through unaffected by the resonators.
  • portions of signals propagating in the first direction at wavelength ⁇ ⁇ ⁇ are split between the north port of the second waveguide 11 1 in the third direction and the south port of the second waveguide 1 1 1 in the fourth direction.
  • the switch building block 100 may multiplex and/or broadcast signals from the first and second directions into the third and fourth directions.
  • the signals propagating in the direction of the first waveguide 110 that initially encounters two resonators in the off state propagate unaffected, while the signals propagating in the other direction of the first waveguide 1 10 are dropped to the port nearest the resonator that is on.
  • the fourth rnicrortng resonator 104 is resonant at the first wavelength ⁇ 3 ⁇ 4 at least a portion of a signal at the first wavelength X% propagating in the first direction in the first waveguide 10 is coupled to a fourth direction opposite to the third direction in the second waveguide 111
  • the signal at the first wavelength continues propagating in the first direction.
  • the second microring resonator 102 is resonant at the second wavelength X 2t at least a portion of a signal at the second wavelength ⁇ 2 propagating in a second direction opposite to the first direction in the first waveguide
  • the signal at the second wavelength continues propagating in the second direction.
  • the switch building block is not limited to a single microring resonator per quadrant as shown in the example of FIG.. 1A. Multiple microring resonators may be cascaded in parallel in each quadrant to achieve arbitrarily shaped optical filter responses.
  • FIG. 2A depicts a diagram of example parallel cascaded resonators 200. As depicted in FIG. 2A, a first set of four microring resonators 101-104 are positioned closest to the first crossing point 115, wit one resonator in each quadrant. At Ieast one additional set of four microring resonators 211-214 is used in the parallel cascaded resonator 200.
  • a first micronng resonator of the additional set 21 1 is positioned in the first quadrant along a diagonal, for example, between the first and second waveguides 1 10, 11 adjacent and coupled fo the first microring resonator of the first set 101
  • a fourth microring resonator of the additional set 214 is positioned in the fourth quadrant along a diagonal, for example, between the first and second waveguides 1 10, 11 1 adjacent and coupled io the fourth microring resonator of the first set 104
  • the first and fourth additional microring resonators 211, 214 are resonant at the first wavelength.
  • the set of parallel cascaded resonators in each quadrant may have different resonant frequencies and/or free spectral range, and be placed in a non-diagonal arrangement.
  • a second microring resonator of the additional set 212 is positioned in the second quadrant adjacent to the second microring resonator of the first set 102, for example, along a diagonal, for example, between the first and second waveguides 110, 1 1 1 .
  • a third microring resonator of the additionai set 213 is positioned in the third quadrant adjacent to the third microring resonator of the first set 213, for example, along a diagonal, for example, between the first and second waveguides 1 10, 1 1 1.
  • the second and third microring resonators of the additional set 213, 214 are resonant at the second wavelength.
  • the set of parallel cascaded resonators in each quadrant may have different resonant frequencies and/or free spectral range, and may be placed in a non-diagonal arrangement.
  • FIG. 2B depicts example optical filter responses of parallel cascaded resonators 200.
  • signals propagating in the first direction may include wavelengths AEI, AEZ AES. and ⁇ , where wavelengths & and ⁇ $ are separated by a free spectral range (FSR), and wavelengths e and AES are also separated by a FSR.
  • resonator 1 101 has a resonant wavelength ⁇
  • resonator 4 104 has a resonant wavelength A .
  • signals propagating in the second direction may include wavelengths ⁇ , X .
  • resonator 2 102 has a resonant wavelength ⁇
  • resonator 3 103 has a resonant wavelength X-m.
  • the top graph In FIG. 2B shows an example filter response for signals dropped to the north output port
  • the bottom graph shows an example filter response for signals dropped to the south output port. Note that the filter response for each dropped wavelength is wider than the notch-shaped filter responses shown in FIG. 1 B associated with the switch building block of FIG. 1A that has a single resonator in each quadrant.
  • the width of the filter response can be made wider with the use of more microring resonators cascaded in parallel in each quadrant of the device shown in FIG. 2A.
  • four cascaded resonators in a quadrant produce a correspondingly wider filter response than three cascaded resonators.
  • Th resonator closest to the first crossing point 1 15 functions like a gat to allow light into and out of the cascaded resonators in that quadrant. For example, if in quadrant 1 , resonator 1 101 is turned on, the light in the first waveguide 10 interacts with every resonator in the first quadrant. However, if resonator 101 is turned off, because the light in the first waveguide 1 10 does not interact with resonator 1 101 , the light has no way to interact with the rest of the resonators in the first quadrant. Also note that the bandwidth of the drop port may be dynamically adjusted by turning on/off one or more resonators in the parallel cascaded array of resonators.
  • FIG. 3 depicts a diagram of example series cascaded resonators 300.
  • the series cascaded resonators 300 includes a first waveguide 110, and a second waveguide 1 1 1 where the first and second waveguides are crossed waveguides.
  • the series cascaded resonators 300 also include a plurality of microring resonators positioned in each quadrant formed by the first and second waveguides 110, 1 11. The plurality of microring resonators in each quadrant are arrayed between the first waveguide 1 10 and the second waveguide 111.
  • the microring resonators 301 , 321 , 31 1 form a line between the first waveguide 1 0 and the second waveguide 1 11 ;
  • the microring resonators 302, 322, 312 form a line between the first waveguide 1 10 and the second waveguide 1 11 ;
  • the microring resonators 303, 323, 313 form a line between the first waveguide 1 10 and the second waveguide 1 1 1 ;
  • the microring resonators 304, 324, 314 form a line between the first waveguide 1 10 and the second waveguide 111 , While the resonators in each quadrant shown in FIG, 3 are formed in a line, the resonators in each quadrant may be arrayed in a nan-coSiinear arrangement.
  • Each microring resonator 301 , 311 in the first quadrant adjacent to the first and second waveguides 1 10, 11 1 , and each microring resonator 304, 314 in the fourth quadrant adjacent to the first and second waveguides 110, 111 may be tunable to a first resonant wavelength.
  • each microring resonator 302, 312 in the second quadrant adjacent to the first and second waveguides 110, 1 1 1 , and each microring resonator 303, 313 in the third quadrant adjacent to the first and second waveguides 1 10, 1 1 1 1 may be tunable to a second resonant wavelength.
  • the first resonant wavelength is different from the second resonant wavelength.
  • the resonators closest to the first and second waveguides 1 10, 1 11 may be tuned together, on or off, depending on the direction a signal should be switched. For example, in quadrant 1 , if resonator 301 and resonator 31 1 are turned on for a particular wavelength, light propagating in the first waveguide at that particular wavelength also interacts with resonator 321. However, if resonator 301 and resonator 311 are turned off for that particular wavelength, light propagating in the first waveguide 1 10 at that particular wavelength cannot interact with resonator 321. In this case, the signal is isolated to resonator 321 and not allowed to proceed from the east port to the west port.
  • the set of parallel cascaded resonators in each quadrant may have different resonant frequencies and/or free spectral range, and/or be placed in a non-colSinear arrangement. Also note that the bandwidth of the drop port can be dynamically adjusted by turning on/off one or more resonators in the parallel cascaded array of resonators.
  • FIG, 4A depicts a diagram of two serially cascaded switch building blocks 400A.
  • a third waveguide 412 and a second set of four tunable microring resonators 401-404 are also included as part of the serially cascaded switch 400A.
  • the first and third waveguides 1 10, 412 cross at a second crossing point 416, and one microring resonator of the second set is positioned near the second crossing point 418 in each quadrant formed by the first and third waveguides 1 10, 412.
  • a first microring resonator of the second set 401 in a first quadrant of the second crossing point and a fourth microring resonator of the second set 404 in a fourth quadrant of the second crossing point may be tunable to resonance at a third wavelength to switch signals at the third wavelength from the first waveguide 110 to the third waveguide 412.
  • a second microring resonator of the second set 402 in a second quadrant of the second crossing point and a third microring resonator of the second set 403 in a third quadrant of the second crossing point may be tunable to resonance at a fourth wavelength to switch signals at the fourth wavelength from the first waveguide 1 10 to the third waveguide 412.
  • the third wavelength may be different from the first wavelength and not an integer multiple of the free spectral range from the first wavelength.
  • the fourth wavelength may be different from the second wavelength and not an integer multiple of the free spectral range from the second wavelength.
  • FI G 4B depicts example input spectra and signals dropped to the output ports of two serially cascaded switch building blocks.
  • the top graph shows signals propagating in the first direction at four wavelengths, ⁇ ⁇ 2, XES, and ⁇ .
  • the difference in wavelength between ⁇ and is a FSR
  • the difference in wavelength between and >,E6 is also a FSR.
  • the second graph shows signals propagating in the second direction at four wavelengths, wi, Xw2, X , and .we.
  • the difference in wavelength between ⁇ ⁇ and Xws is a FSR
  • the difference in wavelength between ⁇ 3 ⁇ 43 ⁇ 4 an Xws ts also a FSR.
  • the third graph shows the signals dropped to the south output ports of the second waveguide 1 1 1 and the third waveguide 412.
  • the solid lines correspond to the signals dropped to the south output port of the second waveguide 1 11
  • the dotted lines correspond to the signals dropped to the south output port of the third waveguide 412 when resonator 103 is tuned to resonance at wavelength ⁇ .
  • resonator 403 is tuned to resonance at wavelength 3 ⁇ 43 ⁇ 4 . Because wavelength Xm is a FSR from wavelength m, resonator 03 is also tuned to resonance at wavelength ⁇ 3 ⁇ 4 ; these wavelengths are indicated within resonator 103 in FIG. 4A.
  • wavelengths ⁇ ⁇ , ⁇ and ws are dropped from the south output port of the second waveguide 1 1 1 via resonator 103.
  • wavelengths / admirW2 and 1 ⁇ 2e are dropped to the south output port of the third waveguide 412 via resonator 403,
  • the bottom graph shows the signals dropped to the north output ports of the second waveguide 1 1 1 and the third waveguide 412.
  • the solid lines correspond to the signals dropped to the north port of the second waveguide 1 1 1
  • the dotted lines correspond to the signals dropped to the north port of the third waveguide 412 when resonator 101 is tuned to resonance at wavelength ⁇ .
  • ⁇ ⁇ and resonator 401 is tuned to resonance at wavelength X I. Because wavelength X S is a FSR from wavelength ⁇ ⁇ , resonator 101 is also tuned to resonance at wavelength XES I these wavelengths are indicated within resonator 101 in FIG. 4A.
  • both wavelengths ⁇ and .ES are dropped to the north port of the second waveguide 1 11 via resonator 101.
  • wavelengths ⁇ and ⁇ 3 ⁇ 4 are dropped to the north port of the third waveguide 412 via resonator 401, Labeled arrows corresponding to each of the signals at the various wavelengths are shown at both input ports and output ports of FIG. 4A.
  • FIG. 4C depicts a diagram of an example of four serially cascaded switch building blocks 400C.
  • the signals in the first waveguide have different wavelengths.
  • Wavelengths ⁇ and X&s are a FSR apart; wavelengths XE2 and Xm are a FSR apart; wavelengths and EI are a FSR apart; and wavelengths ⁇ 3 ⁇ 4 and ES are a FSR apart.
  • wavelengths km and Xws are a FSR apart; wavelengths Xw2 and ⁇ are a FSR apart; wavelengths Xwz and Xwr are a FSR apart; and wavelengths m and Xws are a FSR apart.
  • the FSR should be greater than the wavelength difference between eight times the wavelength separation AX between the wavelength signals to provide some manufacturing tolerance in fabricating the devices.
  • resonator 461 is tuned to resonance at wavelength ⁇ ; resonator 471 is tuned to resonance at wavelength ⁇ ⁇ resonator 481 is tuned to resonance at wavelength , and resonator 491 is tuned to resonance at wavelength A E 4.
  • resonator 463 is tuned to resonance at wavelength AWI; resonator 473 is tuned to resonance at wavelength k ⁇ ; resonator 483 is tuned to resonance at wavelength WS; and resonator 493 is tuned to resonance at wavelength
  • signals with wavelengths wi and Xws are dropped via resonator 483 to the south output port of waveguide 441 , while the remaining signals ar transmitted.
  • wavelengths Xw2 and .we are dropped via resonator 473 to the south output port of waveguide 442, while the remaining signals are transmitted.
  • wavelengths ws and AW? are dropped via resonator 483 to the south output port of waveguide 443, while the remaining signals ar transmitted.
  • the two remaining wavelengths , W 4 and A W S are dropped via resonator 493 to the south output port of waveguide 444.
  • FIG 4D depicts example input spectra and wavelength signals dropped to the output ports of the four waveguides 441-444.
  • the top graph shows the input spectra for signals propagating in the first direction from east to west, and the next graph down shows the input spectra for signals propagating in the second direction from west to east.
  • the third graph from the top in FIG. 4D shows the signals dropped to the south output ports of the four waveguides 441-444.
  • the solid tines correspond to signals dropped to the south output port of the waveguide 441; the dashed Sines correspond to signals dropped to the south output port of the waveguide 442; the dotted Sines correspond to signals dropped to the south output port of the waveguide 443; and the dash-dotted Hnes correspond to signals dropped to the south output port of the waveguide 444.
  • the bottom graph in FIG. 4D shows the signals dropped to the north output ports of the four waveguides 441-444.
  • FIG. 5A depicts an example 2x2 cyclic crossbar switch 500A comprising four waveguides, a first waveguide 1 10, a second waveguide 111 , a third waveguide 512, and a fourth waveguide 513.
  • the first waveguide 110 and the second waveguide intersect at a first crossing point 501 ; the first waveguide 1 10 and the third waveguide 512 intersect at a second crossing point 502; the fourth waveguide 513 and the second waveguide 1 11 intersect at a third crossing point 503; and the fourth waveguide 513 and the third waveguide 512 intersect at the fourth crossing point 504,
  • Light may be coupled into and out of the 2x2 cyclic crossbar switch using grating couplers located at the east, west, north, south ports.
  • a first set of four tunable microring resonators are positioned near the first crossing point 501 in each quadrant formed by the first and second waveguides 1 1 , 1 11 ; a second set of four tunable microring resonators are positioned near the second crossing point 502 in each quadrant formed by th first and third waveguides 110, 512; a third set of four tunable microring resonators are positioned near the third crossing point 503 in each quadrant formed by the fourth and second waveguides 513, 1 1 1 ; and a fourth set of four tunable microring resonators are positioned near the fourth crossing point 604 in each quadrant formed by the fourth and third waveguides 513, 512.
  • a first microring resonator of the first set of resonators in a first quadrant of the first crossing point 501 and a fourth microhng resonator of the first set in a fourth quadrant of the first crossing point 501 are tunable to resonance at a first wavelength to switch signals at the first wavelength from the first waveguide 110 to the second waveguide 111.
  • a second microring resonator of the first set in a second quadrant of the first crossing point 501 and a third microring resonator of the first set in a third quadrant of the first crossing point 501 are tunable to resonance at a second wavelength to switch signals at the second wavelength from the fsrst waveguide 1 10 to the second waveguide 1 11 .
  • a first microring resonator of the second set in a first quadrant of the second crossing point 502 and a fourth microring resonator of the second set in a fourth quadrant of the second crossing point 502 are tunable to resonance at a third wavelength to switch signals at the third wavelength from the first waveguide 1 10 to the third waveguide 512.
  • a second microring resonator of the second set in a second quadrant of the second crossing point 502 and a third microring resonator of the second set in a third quadrant of the second crossing point 502 are tunable to resonance at a fourth wavelength to switch signals at the fourth wavelength from the first waveguide 110 to the third waveguide 512.
  • the third wavelength is different from the first wavelength and not an integer muStipie of the free spectral range from the first wavelength
  • the fourth wavelength is different from the second wavelength and not an integer multiple of the free spectra! range from the second wavelength.
  • a first microring resonator of the third set in a first quadrant of the third crossing point 503 and a fourth microring resonator in a fourth quadrant of the third crossing point 503 are tunabie to resonance at the third wavelength to switch signals at the third vvaveiength from the fourth waveguide 513 to the second waveguide 111.
  • a second microhng resonator in a second quadrant of the third crossing point 503 and a third microring resonator in a third quadrant of the third crossing point 503 are tunable to resonance at the fourth wavelength to switch signals at the fourth wavelength from the fourth waveguide 5 3 to the second waveguide 1 1 1 ,
  • the four microring resonators of th third set have a same free spectral range
  • a first microring resonator of the fourth set in a first quadrant of the fourth crossing point 504 and a fourth microring resonator of the fourth set in a fourth quadrant of the fourth crossing point 504 are tunabie to resonance at a first wavelength to switch signals at the first wavelength from the fourth waveguide 513 to the third waveguide 512
  • a second microring resonator in a second quadrant of the fourth crossing point 504 and a third microring resonator in a third quadrant of the fourth crossing point 504 are tunable to resonance at a second wavelength to switch signals at the second wavelength from the fourth waveguide 513 to the third waveguide 512.
  • the four microring resonators of the fourth set have a same free spectral range.
  • the resonators in the first and third quadrants of the crossing points 501-504 are labeled with the respective wavelengths at which the resonator is resonant.
  • the resonators in the second and fourth quadrants are off or non-resonant.
  • Each of the input ports E1 , E2 from the east for signals propagating in the first direction has signals at the same two wavelengths, ⁇ g and 1 ⁇ 4
  • Each of the input ports W1 , W2 from the west for signals propagating in the second direction has signals at the same two wavelengths, ⁇ and ⁇
  • the signals with the same wavelengths that are transmitted via different input ports should not be dropped to the same output port to prevent collisions of signals having the same wavelength but carrying different data.
  • a signal with wavelength ⁇ 5 from input port El is dropped to the north output port of the second waveguide 1 1 1 1
  • a signal with wavelength AS from input port E2 is dropped to the north output port of the third waveguide 512 to prevent collisions.
  • a signal with wavelength ⁇ 6 from input port E1 is dropped to the north output port of the third waveguide 512, while a signal with wavelength ⁇ from input port E2 is dropped to the north output port of the second waveguide 111 to prevent collisions.
  • a signal with waveiength ⁇ from input port W1 is dropped to the south output port of the second waveguide 111, while a signal with wavelength ⁇ from input port W2 is dropped to the south output port of the third waveguide 512 to prevent collisions.
  • a signal with waveiength ), 2 from input port W1 is dropped to the output south port of the third waveguide 512, while a signal with wavelength X 2 from input port W2 is dropped to the south output port of the second waveguide 111 to prevent collisions.
  • FIG. 5B depicts an example 4x4 cyclic crossbar switch 5008 comprising four east-west waveguides 501-504 and four north-south waveguides with 16 crossing points.
  • the resonators in the first and third quadrants of each crossing point are labeled with the respective wavelengths at which the resonator is resonant.
  • the resonators in the second and fourth quadrants are off or non-resonant in the example of FIG, 5B, Signals at four different wavelengths ⁇ 6 , ⁇ ?, ⁇ are transmitted in the first direction from east to west in each east-west waveguide 501-504, and signals at four other different wavelengths ⁇ ( ⁇ 2, ⁇ 3 .
  • ⁇ are transmitted in the second direction from west to east in each east-west waveguide 501-504,
  • signals having the same wavelength that are transmitted from a different input port should not be dropped to the same output port.
  • a cyclic pattern may be adopted for distributing signals having the same wavelengths and propagating from different input ports to different waveguide output ports.
  • the resonators in the first quadrant of the crossing points of the top waveguide 501 in the switch are resonant at the wavelengths In the following sequence: . ⁇ >. X 6r ⁇ ? , ⁇ , from left to right in the switch.
  • these resonators drop signals having the respective resonant wavelengths to the corresponding north output ports in the different waveguides.
  • the resonators in the first quadrant of the crossing points of the next waveguide down 502 in the switch are resonant at the wavelengths in the following sequence: kg, Xs, ⁇ , , from left to right in the switch.
  • the resonances have been cycled one resonator to the right, and the Sast resonant wavelength wraps back around to the leftmost resonator.
  • the resonators in the first quadrant of the crossing points of the next waveguide down 503 in the switch are resonant at the wavelengths in the following sequence: ⁇ 7; ⁇ , ks , ⁇ , from left to right in the switch
  • the resonators in the first quadrant of the crossing points of the bottom waveguide 504 in the switch are resonant at the wavelengths in the following sequence: ⁇ , ⁇ , ⁇ 8, As ? from left to right in the switch.
  • the same type of cyclic pattern occurs for the input signals from the west input ports.
  • FIG. 6A depicts a diagram of an example switch building block with four photodetectors that tap light from the respective microring resonators.
  • Light may be tapped from the microring resonators by using a waveguide 611-614 coupled to each resonator as the resonator control signal is swept across an appropriate range.
  • photodetectors 601-804 may receive the tapped off Sight power to measure the spectral response of the light for use as a feedback signal to calibrate the corresponding resonator.
  • a photodetector 821-624 may be integrated within each of the microring resonators, as shown in FIG. 6B.
  • a broad wavelength range or several wavelength signals may be transmitted from a source, and the refractive index of each microring resonator may be swept across a range of refractive indices while monitoring the power detected by the photodetector.
  • the refractive index of a microring resonator may be changed in a number of ways, such as using micro-heaters and the thermo-optic effect to temperature tune the resonators, applying an electric field to semiconductor materials and polymers of the resonators and using the bulk electro-optic effect, and moving a mechanical feature close to the resonator structure to impact its refractive index or moving a lossy material to the resonator so no energy is permitted to build up in the resonator.
  • the detector When sweeping the refractive index of the resonators, at the resonant frequency, the detector shou!d detect a peak signal power level, and at non-resonani frequencies, the detector should not, in the ideal case, detect any signal
  • the control signal at which a resonator is on, or resonant, for a particular wavelength and the control signal at which the resonator is off, or non-resonant, should be stored in a memory for subsequent tuning of each resonator. Then the management layer of the network may use this data for tuning the resonators as needed for dropping wavelength signals to appropriate drop ports.
  • FIG. 7 A depicts a 2x2 cyclic crossbar switch 700 with example shared photodetectors 701-704.
  • the east input ports A, B may use the photodetector 702 near north output port E to calibrate the resonators in the first quadrant of the crossing points 731 , 733 formed by the intersection of the waveguide 713 with the waveguides 711 , 712.
  • the west input ports C, D may also use the photodetector 702 near the north output port E to calibrate the resonators in the second quadrant of the crossing points 731, 733.
  • FIGS, 7A and 7B show the photodetectors integrated with the waveguides 71 -714, they may be implemented off-chip as a separate component or components.
  • the east input ports A, B may use the photodetector 701 near north output port F to calibrate the resonators in the first quadrant of the crossing points 732, 734 formed by the intersection of the waveguide 714 with the waveguides 711 , 712.
  • the west input ports C, D may also use the photodetector 701 near north output port F to calibrate the resonators in the second quadrant of the crossing points 732, 734.
  • shared photodetectors 703, 704 near the south output ports F, G may be used to calibrate resonators that drop signals to the south output ports.
  • the time-shared photodetectors 721- 724 may be positioned to measure signals at the east and west input ports, rather than the north and south output ports. However, in this case, a through measurement of signals transmitted to the west port from the east port should not be performed simultaneously with a through measurement of signals transmitted to the east port from the west port to distinguish resonators dropping coupled signals.
  • the photodetectors for a 2x2 cyclic crossbar switch may include a first set of two shared photodetectors 721, 722 to detect light in a first waveguide 71 1 and a fourth waveguide 712 at a first set of input ports to a first side of the four crossing points 731-734, and a second set of two shared photodetectors 723, 724 to detect light in the first waveguide 1 1 and the fourth waveguide 712 at a second set of input ports at a second side opposite from the first side of the four crossing points 731-734,
  • the photodetectors for a 2x2 cyclic crossbar switch may include a third set of two shared photodetectors 701 ( 702 to detect light in the second waveguide 713 and the third waveguide 714 at a first set of output ports to a third side of the four crossing points 731-734, and a fourth set of two shared photodetectors 703, 704 to detect light In the second waveguide 713 and the third waveguide 714
  • the photodetectors 701-704 may be operated with forward bias to function as an optical amplifier to amplify light signals transmiited through the photodetectors and cyclic crossbar switch to overcome some of the switch optical losses.
  • FIGS. 8-11 B depict flow diagrams illustrating example processes performed with respect to switch building blocks and 2x2 cyclic crossbar switches.
  • FIG. 12 depicts nomenclature for directions of signals propagating through a 2x2 cyclic crossbar switch, as referenced in the flow diagrams of FIGS. 8-1 I B.
  • F ⁇ . 8 depicts a flow diagram illustrating an example process 800 of tuning microring resonators of a switch building block to transmit and drop a first signai
  • a first signal may be transmitted at a first wavelength in a first direction along a first waveguide.
  • the first waveguide crosses a second waveguide at a first crossing point, and a first set of four microring resonators are positioned near the first crossing point with one microring resonator in each quadrant formed b the first and second waveguides,
  • a first microring resonator of the first set in a first quadrant formed by the first and second waveguides may be tuned.
  • a fourth microring resonator of the first set in a fourth quadrant formed by the first and second waveguides may be tuned.
  • the first and fourth microring resonators of the first set may be tuned such that an effect on the first signai is selectable from one of the following: 1 ⁇ the first signal is dropped to a third direction along the second waveguide, 2) the first signal is dropped to a fourth direction along the second waveguide that is opposite to the third direction, 3 ⁇ a first portion of the first signal is dropped to the third direction and a second portion of the first signal is dropped to the fourth direction, and 4) the first signal continues in the first direction.
  • FIGS. 9A and 9B depict a flow diagram illustrating an example process 900 of tuning microring resonators of a switch building block to transmit and drop a first and a second signal, and to calibrate the microring resonators.
  • the process begins at block 905 which may he similar to block 805 described with respect to the process 800 of FIG. 8.
  • Blocks 910 and 915 may also be similar to blocks 810 and 815, respectively, of FIG. 8,
  • a second signal may be transmitted at a second wavelength in a second direction opposite the first direction along the first waveguide.
  • the second wavelength is different from the first wavelength, and the four microring resonators of the first set have a same fre spectral range. Also, the second wavelength is not a multiple of the free spectra! range from the first wavelength.
  • a second microring resonator of the first set in a second quadrant formed by the first and second waveguides may be tuned.
  • a third microring resonato of the first set in a third quadrant formed by the first and second waveguides may be tuned.
  • the second and third microring resonators of the first set may be tuned such that an effect on the second signal is selectable from one of the following: 1 ) the second signal is dropped to the third direction along the second waveguide, 2 ⁇ the second signal is dropped to the fourth direction along the second waveguide, 3) a first portion of the second signal is dropped to the third direction and a second portion of the second signal is dropped to the fourth direction, and 4) the second signal continues in the second direction
  • the microring resonators may be calibrated using photodeiectors positioned in different locations.
  • a first photodetector detects power from a first position along the second waveguide beyond the first and second microring resonators of the first set from the first crossing point
  • a second photodetector detects power from a second position along the second waveguide beyond the third and fourth microring resonators of the first set from the first crossing point.
  • the photodetectors may detect power from the north output port and south output port of the second waveguide, where the positional labels shown in F!G. 1A are referenced here.
  • calibration signals may be transmitted simultaneously or sequentially in the first direction and the second direction along the first waveguide.
  • the refractive indices of th resonators may be swept, and the first and second photodetectors may be operated in reverse bias to calibrate the microring resonators of the first set.
  • a third photodetector detects power from a third position along the first waveguide beyond the first and fourth microring resonators of the first set from the first crossing point
  • a fourth photodetector detects power from a fourth position aiong the first waveguide beyond the second and third microring resonators of the first set from the first crossing point.
  • the photodetectors ma detect power from the east input port and west input port of the first waveguide, referencing the positional labels shown in FIG. 1 A.
  • calibration signals may be transmitted sequentially in the third and fourth directions along the second waveguide.
  • the refractive indices of the resonators may be swept, and the third and fourth photodetectors may be operated in reverse bias to calibrate the microring resonators of the first set.
  • the first and second photodetectors may be operated with forward bias to amplify signals propagating in the third and fourth directions, and the third and fourth photodetectors may be operated with forward bias to amplify signals propagating in the first and second directions.
  • FIG. 10 depicts a flow diagram illustrating an example process 1000 of using a switch building block to transmit an additional signal in a waveguide with the first signal.
  • Block 1005 may again be similar to block 805 described with respect to the process 800 of FIG. 8.
  • Blocks 1010 and 1015 may also be similar to blocks 810 and 815, respectively, of FIG. 8.
  • an additional signal at an additional wavelength may be transmitted in the first direction along the first waveguide.
  • the additional wavelength is different from th first wavelength.
  • each microring resonator of the first set of four microring resonators has a same free spectral range, and the additional wavelength is a multiple of the free spectral from the first wavelength.
  • FIGS, 11A and 11B depict a flow diagram illustrating an example process 1100 of using a 2x2 cyclic crossbar switch.
  • Block 1105 begins at block 1105 which may yet again be similar to block 805 described with respect to the process 800 of FIG. 8.
  • Blocks 1110 and 1115 may also be similar to blocks 810 and 815, respectively, of FIG. 8.
  • a third signal at a third wavelength may be transmitted in the first direction along the first waveguide.
  • the third wavelength is different from the first wavelength, and the third wavelength is not a multiple of the free spectra! range from the first wavelength.
  • the first and fourth microring resonators of the first set have no effect on the third signal near the first crossing point, and wherein a third waveguide crosses the first waveguide at a second crossing point, and a second set of four microring resonators are positioned near the second crossing point with one microring resonator of the second set in each quadrant formed by the first and third waveguides.
  • a first microring resonato of the second set in a first quadrant formed by the first and third waveguides may be tuned, and at block 1130, a fourth microring resonator of the second set in a fourth quadrant formed by the first and third waveguides may be tuned.
  • the first and fourth microring resonators of the second set ma be tuned such that an effect on the third signal is selectable from one of the following: 1 ) the third signal is dropped to a fifth direction along the third waveguide, 2) the third signal is dropped to a sixth direction along the third waveguide thai is opposite the fifth direction, 3) a first portion of the third signal is dropped to the fifth direction and a second portion of the third signal is dropped to the sixth direction, and 4) the third signal continues in the first direction.
  • the first and fourth microring resonators of the second set each have a resonant wavelength different from the first wavelength and have no effect on the first signai [0088
  • a fifth signal may be transmitted at the first wavelength in a seventh direction along a fourth waveguide.
  • the fourth waveguide crosses the second waveguide at a third crossing point and crosses the third waveguide at a fourth crossing point.
  • a third set of four microring resonators are positioned near the third crossing with one microring resonator of the third set in each quadrant formed by the fourth and second waveguides.
  • a fourth set of four microring resonators are positioned near the fourth crossing with one microring resonator of the fourth set in each quadrant formed by the fourth and third waveguides.
  • a second microring resonator of the third set in a second quadrant formed by the fourth and second waveguides, and a third microring resonator of the third set in a third quadrant formed by the fourth and second waveguides each have a resonant wavelength that is different from the first wavelength and have no effect on the fifth signal
  • a first microring resonator of the fourth set in a first quadrant formed by the fourth and third waveguides may be tuned.
  • a fourth microring resonator of the fourth set in a fourth quadrant formed by the fourth and third waveguides may be tuned.
  • the first and fourth microring resonators of the fourth set may be tuned such that the effect on the fifth signal is selectable from one of the following: 1 ) the fifth signal is dropped to the fifth direction along the third waveguide, 2 ⁇ the fifth signal is dropped to the sixth direction opposite the fifth direction aiong the third waveguide, 3) a first portion of the fifth signal is dropped to the fifth direction and a second portion of the fifth signal is dropped to the sixth direction, and 4) the fifth signal continues in the seventh direction.
  • a seventh signal may b transmitted at the third wavelength in the seventh direction along the fourth waveguide.
  • the first microring resonator of the third set in a first quadrant formed by the fourth and second waveguides may be tuned.
  • the fourth microring resonator of the third set in a fourth quadrant formed by the fourth and second waveguides may be tuned.
  • the first and fourth microring resonators of the third set may be tuned such that the effect on the seventh signal is selectable from one of the following: 1 ⁇ the seventh signal is dropped to a third direction along the second waveguide, 2 ⁇ the seventh signal is dropped to a fourth direction opposite the third direction along the second waveguide, 3) a first portion of the seventh signal is dropped to the third direction and a second portion of the seventh signal is dropped to the fourth direction, and 4) the seventh signal continues in the seventh direction.
  • the first microring resonator of the fourth set in a first quadrant formed by the fourth and third waveguides, and the fourth microring resonator of the fourth set in the fourth quadrant formed by the fourth and third waveguides have no effect on the seventh signal.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

Dans les exemples d'après la présente invention, un procédé transmet un signal à une première longueur d'onde dans une première direction le long d'un premier guide d'ondes. Le premier guide d'ondes croise un second guide d'ondes en un point de croisement. Quatre résonateurs à micro-anneau sont positionnés à proximité du point de croisement, un résonateur par quadrant formé par les guides d'ondes. Le procédé accorde les premier et quatrième résonateurs à micro-anneau dans les premier et quatrième quadrants respectivement de telle sorte qu'un effet sur le signal peut être sélectionné parmi : 1) le signal est abaissé dans une troisième direction le long du second guide d'ondes ; 2) le signal est abaissé le long du second guide d'ondes dans une quatrième direction opposée à la troisième ; 3) une première partie du signal est abaissée dans la troisième direction et une seconde partie du signal est abaissée dans la quatrième direction ; et 4) le signal se poursuit dans la première direction.
PCT/US2015/013125 2015-01-27 2015-01-27 Commutateurs à résonateurs à micro-anneau accordables WO2016122464A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2015/013125 WO2016122464A1 (fr) 2015-01-27 2015-01-27 Commutateurs à résonateurs à micro-anneau accordables

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2015/013125 WO2016122464A1 (fr) 2015-01-27 2015-01-27 Commutateurs à résonateurs à micro-anneau accordables

Publications (1)

Publication Number Publication Date
WO2016122464A1 true WO2016122464A1 (fr) 2016-08-04

Family

ID=56543894

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2015/013125 WO2016122464A1 (fr) 2015-01-27 2015-01-27 Commutateurs à résonateurs à micro-anneau accordables

Country Status (1)

Country Link
WO (1) WO2016122464A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112087259A (zh) * 2019-06-12 2020-12-15 中兴通讯股份有限公司 一种光交换网络的检测方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004070445A1 (fr) * 2003-01-30 2004-08-19 Centre National De La Recherche Scientifique Dispositif d'aiguillage selectif en longueur d'onde
US20060159392A1 (en) * 2003-07-15 2006-07-20 Milos Popovic Optical coupled-resonator filters with asymmetric coupling
US20090067773A1 (en) * 2006-09-11 2009-03-12 Krug William P Rapidly tunable wavelength selective ring resonator
US20090110348A1 (en) * 2007-10-31 2009-04-30 Alexandre Bratkovski Magnetically Activated Photonic Switches And Switch Fabrics Employing The Same
US20110103799A1 (en) * 2006-12-22 2011-05-05 Assaf Shacham Systems And Methods For On-Chip Data Communication

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004070445A1 (fr) * 2003-01-30 2004-08-19 Centre National De La Recherche Scientifique Dispositif d'aiguillage selectif en longueur d'onde
US20060159392A1 (en) * 2003-07-15 2006-07-20 Milos Popovic Optical coupled-resonator filters with asymmetric coupling
US20090067773A1 (en) * 2006-09-11 2009-03-12 Krug William P Rapidly tunable wavelength selective ring resonator
US20110103799A1 (en) * 2006-12-22 2011-05-05 Assaf Shacham Systems And Methods For On-Chip Data Communication
US20090110348A1 (en) * 2007-10-31 2009-04-30 Alexandre Bratkovski Magnetically Activated Photonic Switches And Switch Fabrics Employing The Same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112087259A (zh) * 2019-06-12 2020-12-15 中兴通讯股份有限公司 一种光交换网络的检测方法
CN112087259B (zh) * 2019-06-12 2023-08-25 中兴通讯股份有限公司 一种光交换网络的检测方法

Similar Documents

Publication Publication Date Title
US10459168B2 (en) Optical devices and method for tuning an optical signal
US6301031B2 (en) Method and apparatus for wavelength-channel tracking and alignment within an optical communications system
US11002912B2 (en) Tunable ring resonator multiplexers
CN111865471B (zh) 一种光分插复用装置及其控制方法
US8897646B2 (en) Optical add/drop multiplexer
US10795089B2 (en) Optical circuits and optical switches
US6671437B2 (en) Method and device for tunable frequency selective filtering of optical signals
CN101405975A (zh) 上路和下路波长信道
US20170187483A1 (en) Low transit loss add-drop multiplexing node for all optical networking
CN104317005A (zh) 基于可调谐微环谐振器的波长选择光开关
US10097304B2 (en) Optical switch, an optical switching apparatus, an optical communications network node and an optical communications network
US20050147348A1 (en) Hitless variable-reflective tunable optical filter
KR20010071484A (ko) 광 파장의 스위칭 및 재지향을 위한 방법 및 다중-파장선택 스위칭
WO2016122464A1 (fr) Commutateurs à résonateurs à micro-anneau accordables
CN100353196C (zh) 波长选择型开关
SE518532C2 (sv) Våglängdsselektiv anordning respektive väljare samt förfarande därvid
Tunesi et al. Novel design and operation of photonic-integrated wss for ultra-wideband applications
JP4047004B2 (ja) 光波長可変フィルタの制御方法および制御装置
US20180164656A1 (en) Optical signal processing device
Yuan et al. 16-channel flexible optical passband filter array for CDCF ROADM
EP3605172B1 (fr) Multiplexeur d'insertion-extraction optique reconfigurable
JP2003029234A (ja) 光スイッチ装置、それを適用した光受信装置および光スイッチ網
KR20020021140A (ko) 동조 가능한 광 필터
WO2019207487A1 (fr) Multiplexeur d'insertion-extraction optique reconfigurable à faible puissance
CN116846507A (zh) 一种延迟单元共用的硅基多波束形成网络芯片

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15880367

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15880367

Country of ref document: EP

Kind code of ref document: A1