WO2023232960A1 - Multiplexeur optique programmable à insertion-extraction pour réseau de communication à filtre optique bidirectionnel - Google Patents

Multiplexeur optique programmable à insertion-extraction pour réseau de communication à filtre optique bidirectionnel Download PDF

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Publication number
WO2023232960A1
WO2023232960A1 PCT/EP2023/064724 EP2023064724W WO2023232960A1 WO 2023232960 A1 WO2023232960 A1 WO 2023232960A1 EP 2023064724 W EP2023064724 W EP 2023064724W WO 2023232960 A1 WO2023232960 A1 WO 2023232960A1
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Prior art keywords
optical
wavelength
amplifier
port
oadm
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PCT/EP2023/064724
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English (en)
Inventor
Luca Giorgi
Paola Iovanna
Alfredo Palagi
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Telefonaktiebolaget Lm Ericsson (Publ)
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Publication of WO2023232960A1 publication Critical patent/WO2023232960A1/fr

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    • 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
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/297—Bidirectional amplification

Definitions

  • the present disclosure relates generally to a programmable optical add-drop multiplexer (OADM) and a bi-directional amplifier for a communication network having a bi-directional optical fiber, and related apparatuses and methods.
  • OADM programmable optical add-drop multiplexer
  • the evolution of fifth generation (5G) to 5G-Beyond and sixth generation (6G) may further enforce a need to use Dense Wavelength Division Multiplexing (DWDM) technology for high bandwidth and low latency requirements.
  • DWDM Dense Wavelength Division Multiplexing
  • the evolution of a radio access network (RAN) in a centralized location and a cloud RAN also may require using DWDM in an access segment to connect several antenna sites to the centralized site (e.g., a central office of an operator(s)).
  • a centralized site e.g., a central office of an operator(s)
  • several infrastructures may be used to connect antennas (e.g., chains and tree).
  • the DWDM technology may be used in an overlay on already installed passive optical network (PON) infrastructure.
  • PON passive optical network
  • a programmable OADM for a communication network having a bi-directional optical fiber includes a bi-directional amplifier comprising a first and a second three-port wavelength selection device respectively configured to route a downstream channel and/or an upstream channel from the bi-directional optical fiber based on a wavelength of the respective downstream channel or upstream channel.
  • the OADM further includes a power splitter/combiner having (i) a common port connected to an output/input of the bi-directional amplifier and (ii) a plurality of power splitter/combiner ports.
  • the OADM further includes at least one tunable add-drop component comprising a common add/drop port connected to a respective one of the plurality of power splitter/combiner ports, a drop port configured to drop a defined wavelength from the downstream channel applied to the common add/drop port, and an add port configured to add to the common add/drop port an assigned wavelength from the upstream channel when the upstream channel is applied to the add port.
  • a bi-directional amplifier for a communication network having a bi-directional optical fiber is provided.
  • the bi-directional amplifier includes a first three-port wavelength selection device; and a second three-port wavelength selection device.
  • the first and the second three- port wavelength selection devices are respectively configured to route a downstream channel and/or an upstream channel from the bi-directional optical fiber based on a wavelength of the respective downstream channel or upstream channel.
  • Potential advantages provided by various embodiments of the present disclosure may include that the architecture of the OADM may hinder reflections and may be low loss; and/or that the bi-directional amplifier may counteract or reduce reflection effects based on the properties of three-port wavelength selection devices in combination with an appropriate mapping (e.g., programming) for downstream and upstream flows.
  • an appropriate mapping e.g., programming
  • Figure 1 is a schematic diagram illustrating a fronthaul network architecture in accordance with some embodiments of the present disclosure
  • Figure l is a block diagram illustrating a bi-directional amplifier
  • Figure 3 is a schematic diagram illustrating optical signals and reflected signals in the bi-directional amplifier of Figure 2;
  • Figure 4 is a block diagram illustrating another bi-directional amplifier
  • Figure 5 is a schematic diagram illustrating optical signals and reflected signals in the bi-directional amplifier of Figure 4.
  • Figure 6 is a block diagram illustrating a bi-directional amplifier in accordance with some embodiments of the present disclosure.
  • Figure 7 is a block diagram illustrating a bi-directional amplifier in accordance with some embodiments of the present disclosure.
  • Figure 8 is a schematic diagram illustrating optical signals and reflected signals travelling in a bi-directional amplifier in accordance with some embodiments of the present disclosure
  • Figure 9 is a schematic diagram illustrating optical signals and reflected signals travelling in a bi-directional amplifier in accordance with some embodiments of the present disclosure.
  • FIGS. 10A and 10B are block diagrams of a tunable add-drop component in accordance with some embodiments of the present disclosure.
  • FIG. 1 is a schematic diagram illustrating an example fronthaul network architecture 100 in accordance with some embodiments of the present disclosure.
  • a multipl exer/demultiplexer (Mux/DeMux) device 109 routes input wavelengths in a wavelengths comb (referred to herein as a downstream comb) at the output optical fiber 113.
  • a wavelengths comb referred to herein as a downstream comb
  • Mux/DeMux 109 also extracts individual wavelengths from an input wavelength comb (referred to herein as an upstream comb) and routes an extracted wavelength(s) on one assigned output fiber.
  • a single feeder optical fiber 113 connects the central office 107 with an optical distribution node (ODN) 105 where a 1 :R power spliter replicates the arriving DWDM downstream comb on each of the R output fibers 115a-115n and combines the R upstream combs, coming from the remote antenna sites 103a-103n on a communication port toward the central office 107.
  • ODN optical distribution node
  • antenna sites 103b, 103d, and 103e are not annotated but correspond to the antenna sites connected to the optical add-drop multiplexers (OADM) 101b, 101 d, and lOle, respectively.
  • OADM optical add-drop multiplexers
  • a respective OADM lOla-lOln routes a sub-set of wavelengths of the incoming downstream comb toward assigned local receivers and adds the sub-set of wavelengths, locally generated at the respective antenna sites 103a- 103n, to the outgoing upstream comb.
  • a tunable optical transmitter and low-cost programmable OADM may not only simplify installation procedures, but also may allow for remote, automatic programmable network configuration (e.g., via a computing device). While the OADM lOla-lOln in Figure 1 are illustrated at antenna sites 103a-103n, one or more of the OADMs lOla-lOln may be located at a remote site in the field or at a central office (e.g., central office 107). For example, to reduce inventory costs, it may be useful to provide OADMs where the wavelengths assigned to an add and/or drop port of the OADM can be selected /configured via dynamic remote programming of the OADM.
  • a programmable OADM(s) in a terrestrial metropolitan and/or core network may use a microelectromechanical system (MEMS) and/or liquid crystal technologies whose cost may hardly scale down to technological-economic feasibility of access networks.
  • MEMS microelectromechanical system
  • liquid crystal technologies whose cost may hardly scale down to technological-economic feasibility of access networks. See e.g., F. Cavaliere, L. Giorgi and L. Poti, "Transmission and Switching Technologies for 5G Transport Networks," 2018 IEEE Optical Interconnects Conference (OI), Santa Fe, NM, 2018, pp. 47- 48.
  • OADMs mini-remote OADMs
  • tunable refers to a capability to set tunable wavelengths for add, drop, and passthrough channels dynamically via programming the OADM (e.g., via remote programming of the OADM with a computing device).
  • bidirectional OADMs may be based on optical filters but with several implementation variants depending on a number and set of added/dropped wavelengths, and number of input and output optical ports. This may lead to a large number of product variants, where the product variants each may be deployed in small volumes. To avoid such a market fragmentation and to benefit from larger economies of scale, it may be beneficial to have a single programmable OADM that is compatible with all configurations of Figure 1 (as an example architecture) that includes the following features:
  • a fixed add/drop module e.g., a module that is capable to add and drop a fixed small number of predetermined wavelengths (e.g., four predetermined wavelengths).
  • current fixed optical add drop multiplexers may meet features ii. and iii ., but may not meet features i. and iv.
  • current reconfigurable OADMs based on wavelength selective switches may meet features i. and ii. while adding expensive and bulky ad hoc equipment, but may not meet features iii. and iv.
  • ROADMs based on silicon photonics may meet feature i. with some limitations, and features ii. and iii., but may not meet feature iv.
  • a bidirectional optical amplifier 201 (BiDi-amplifier) as illustrated in Figure 2 may be used to try to counteract the network losses.
  • the BiDi-amplifier 201 is based on two optical amplifiers (OAs), OA 205a and OA 205b, and two optical circulators, circulator 203a and circulator 203b.
  • the optical circulators 203a, 203b are directi on- selective devices; and they route the signals received on one of the ports 203a, 203b, 203c or on one of the ports 207a, 207b, 207c to another port of circulator 203a or circulator 207 depending on the signal’s direction.
  • FIG 3 is a schematic diagram illustrating optical signals and reflected signals in the bi-directional amplifier 201 of Figure 2.
  • the phrase “reflected downstream” (R-D) signals refers to undesired signals that are generated by optical reflections of signals travelling in the opposite direction (downstream in this case) with respect to upstream flow and that follow an upstream signal in the upstream direction; and the phrase “reflected upstream” (R-U) signals refers to undesired signals that are generated by optical reflections of signals travelling in the opposite direction (upstream in this case) with respect to downstream flow and that follow a downstream signal in the downstream direction.
  • Circulator 207 routes the two combs (upstream and R-D) on its port 207b, and the upstream and the R-D signals come out of the BiDi amplifier 201 via 101b port (also referred to herein as the “Line East” port).
  • both the incoming downstream (down) comb and reflected upstream (R-U) comb applied to the line 101b port arrive to the port 207b of circulator 207 where they are routed to the port 207c and sent to the OA 205b.
  • the downstream and R-U signals are amplified and sent to the port 203c of circulator 203.
  • Circulator 203 routes the two combs on its port 403a, and the downstream and R-U signals come out of the BiDi amplifier 201 via the line 101a port. While the terms “Line West” and “Line East” are used herein to refer to opposite directions, the opposite directions of embodiments of the present disclosure are not limited to West-East directions and may include any opposite directions.
  • Figure 4 is block diagram illustrating an implementation variation of bi-directional amplifier 201 where circulators 203 and 207 of Figure 2 are substituted in Figure 4 with two 1 :2 power splitters 403 and 407 (e.g., two 3dB splitters) and two optical isolators 405a, 405b.
  • two 1 :2 power splitters 403 and 407 e.g., two 3dB splitters
  • the architecture of the BiDi amplifier 201 of Figure 4 works the same as the BiDi amplifier 201 of Figure 2, as illustrated in Figure 5.
  • signals that flow into the BiDi-amplifier 201 are illustrated.
  • both the incoming upstream (up) comb and reflected downstream (R-D) comb arrive to the port 403a of splitter 403 where they are routed to the port 403b and sent to the OA 205a.
  • the upstream and R-D signals are amplified and sent to the port 407a of splitter 407.
  • Splitter 407 routes the two combs (upstream and R-D) on its port 407b, and the upstream and the R-D signals come out of the BiDi amplifier 201 via the line 101b port.
  • both the incoming downstream (down) comb and reflected upstream (R-U) comb applied to the line 101b port arrive to the port 407a of splitter 407 where they are routed to the port 407c and sent to the OA 205b.
  • the downstream and R-U signals are amplified and sent to the port 403c of splitter 403.
  • Splitter 403 routes the two combs on its port 403a, and the downstream and R-U signals come out of the BiDi amplifier 201 via 101a port.
  • Both architectures of the BiDi-amplifier 201 shown in Figures 2 and 4 may suffer from effects of the reflections of the optical signals including, without limitation, that the reflections that can be concentrated (e.g., due to device return loss or fiber connectors return loss) or distributed (e.g., due to Rayleigh or Brillouin backscattering).
  • the reflections may increase noise present on the communication channel in both directions.
  • the power’s reflections may become comparable with those of the signals, which may cause a situation that is not tolerable. For example, this may happen using either architecture of the BiDi-amplifier 201 in a communication network because the reflections may be amplified inside the BiDi amplifier 201 as well as the wanted signal.
  • Various embodiments of the present disclosure may provide solutions to these and other potential problems.
  • Various embodiments of the present disclosure provide a programmable OADM for a bi-directional transmission communication network where the programmability is compatible with chain, point-to-multipoint, and/or mixed topologies.
  • the OADM can be configured to be a passthrough node or a termination node, as discussed further herein.
  • the OADM may amplify optical signals that travel in an opposite direction on the same optical fiber; may be a low loss OADM for application in communication networks characterized by high concentrated insertion loss; may reduce and/or cancel reflections of channels travelling in the opposite direction and, thus, may avoid or reduce their amplification and consequent signal to noise reduction; and/or the modularity of the OADM, including the BiDi amplifier of various embodiments, with reflection reduction/cancellation may help enable evolution of silicon photonics technologies.
  • Evolution of silicon photonics technologies may include the programmable OADM of various embodiments of the present disclosure, which may save costs and power consumption and may address drawbacks of present optical devices that may have a non-negligible insertion loss that limits their application in the field.
  • FIG. 6 is a block diagram illustrating an OADM 601 in accordance with some embodiments of the present disclosure.
  • OADM 601 may be tolerant to reflections (e.g., hinder reflections) and may be low loss.
  • BiDi amplifier 603 includes a design that may hinder reflection effects (e.g., counteract or reduce reflection effects) by exploiting properties of three-port wavelength selective devices in combination with an appropriate wavelength mapping for downstream and upstream flows.
  • a 1:N splitter/combiner 605 and at least one tunable add-drop component 607a-607n may lend modularity and scalability of OADM 601, may provide a passthrough feature on an express (EXP) port (e.g., which may be needed for chain topology), and can provide a channel by channel wavelength programmability to change the configuration for available communication links on each pair of add-drop ports add 1, drop 1 - add n, drop n.
  • EXP express
  • OADM 601 includes a cascade between the 1:N power splitter/combiner 605 and the N-l single channel tunable add-drop components 607a-607n to implement add/drop filter functionality.
  • An unused power splitter/combiner port of splitter/combiner 605 may be used as an EXP port for deployment of OADM 601 in a chain architecture.
  • BiDi amplifier 601 may reduce the losses of OADM 601 and includes an important role in counteracting reflections effects.
  • Conventional BiDi amplifiers may be realized with optical amplifiers and with a direction-selective three-port devices, as discussed herein with respect to the BiDi amplifiers of Figures 2 and 4. Such BiDi amplifiers may have drawbacks discussed herein due to reflections effects that may arise in the communication network based on a single transmission optical fiber with bidirectional communication.
  • FIG. 7 is a block diagram illustrating a BiDi amplifier in accordance with some embodiments of the present disclosure.
  • BiDi amplifier 601 includes two three-ports wavelength selective devices 701a, 701b, two OAs 205a, 205b, and two isolators 405a, 405b.
  • Wavelength selection devices 701a, 701b can route each channel of the DWDM comb depending on the wavelength of the channel itself.
  • a programmable OADM (e.g., OADM 601) is provided for a communication network having a bi-directional optical fiber.
  • the OADM includes a BiDi amplifier (e.g., 603) including a first (e.g., 701a) and a second (e.g., 701b) three-port wavelength selection device respectively configured to route a downstream channel and/or an upstream channel from the bi-directional optical fiber based on a wavelength of the respective downstream channel or upstream channel.
  • the OADM further includes a power splitter/combiner (e.g., 605) having (i) a common port connected to an output/input of the BiDi amplifier and (ii) a plurality of power splitter/combiner ports.
  • the OADM further includes at least one tunable add-drop component (e.g., 607) comprising a common add/drop port connected to a respective one of the plurality of power splitter/combiner ports, a drop port configured to drop a defined wavelength from the downstream channel applied to the common add/drop port, and an add port configured to add to the common add/drop port an assigned wavelength from the upstream channel when the upstream channel is applied to the add port.
  • tunable add-drop component e.g., 607 comprising a common add/drop port connected to a respective one of the plurality of power splitter/combiner ports, a drop port configured to drop a defined wavelength from the downstream channel applied to the common add/drop port, and an add port configured to add to the common add/drop port an assigned wavelength from the upstream channel when the upstream channel is applied to the add port.
  • a respective one of the first and second wavelength selection devices is configured to route a downstream or an upstream channel of a dense wavelength division multiplexing comb based on the wavelength of the channel.
  • the type of three port wavelength selection device included can be based on the wavelength mapping selected for the network.
  • the three port wavelength selection device may be a band splitter (BS) as shown in Figure 8 illustrating optical signals and reflected signals travelling in BiDi amplifier 603 in accordance with some embodiments of the present disclosure.
  • Band splitters 801a, 801b respectively create two different paths for wavelengths belonging to the same sub-bands addressing the reflections toward the respective output port 101a, 101b where the respective isolator 405b, 405a hinders them avoiding/lessening their back propagation.
  • the respective first and second wavelength selection devices comprise a first band splitter (e.g., 801a) and a second band splitter (e.g., 801b), respectively.
  • the first and second band splitters respectively include a communications port configured to connect to the bidirectional optical fiber, a first input/output port, and second input/output port.
  • the upstream (up) comb and the reflected downstream (R-D) comb come in by the Line West 101a port where band splitter 801a routes the upstream comb on input/output (I/O) port 803b toward OA205a; and band splitter 801a routes the R-D comb on I/O port 803c toward isolator 405b which hinders its propagation.
  • the amplified upstream comb arrives at I/O port 807b of band splitter 801b where it is routed on communications port 707a and leaves BiDi amplifier 603 by Line East 101b port.
  • the downstream (down) comb and the reflected upstream (R- U) comb come into BiDi amplifier 603 from the Line East 101b port where band splitter 801b routes the downstream comb on port 807c toward OA 205b; and BiDi amplifier 603 routes the R-U comb on I/O port 807b toward the isolator 405a which hinders its propagation.
  • the amplified downstream comb arrives at the I/O port 803c of band splitter 801a where it is routed on communications port 703a and leaves BiDi amplifier 603 by the Line West 101a port.
  • the first and second band splitters are respectively configured to create two paths for wavelengths belonging to a same sub-band comprising (i) a wavelength in the downstream channel or the upstream channel and (ii) a reflected wavelength from an optical reflection of a signal that travels in a direction opposite the wavelength in the downstream channel or the upstream channel.
  • the BiDi amplifier 603further includes a first optical amplifier 205a positioned between the first input/output ports of the first 801a and the second 801b band splitters and a second optical amplifier 205b positioned between the second input/output ports of the first 801a and the second 801b band splitters.
  • the BiDi amplifier 603 further includes a first isolator 405a positioned between the first input/output port of the first band splitter 801a and the first optical amplifier 205a, and a second isolator 405b positioned between the second input/output port of the second band splitter 801b and the second optical amplifier 205b.
  • the first isolator and the second isolator are configured to hinder propagation of the reflected wavelength.
  • the BiDi amplifier 603 is further configured to amplify the wavelength in the upstream channel with the first optical amplifier and route the amplified upstream wavelength to the communication port of the second band splitter.
  • the BiDi amplifier 603 is further configured to amplify the wavelength in the downstream channel with the second optical amplifier and route the amplified downstream wavelength to the communications port of the first band splitter.
  • the wavelength selection device when the upstream (up) and the downstream (down) channels are interleaved (e.g., odd channels for downstream and even channels for upstream), can be an optical interleaver and reflected signals can be routed toward the output port of the isolator that hinders them concluding/lessening their back propagation.
  • Figure 9 is a schematic diagram showing an example of an interleaver variant of BiDi amplifier 603.
  • the respective first and second wavelength selection devices when the downstream channel and the upstream channel are interleaved, include a first optical interleaver 901a having a first set of channels for downstream and a second optical interleaver 901b having a second set of channels for upstream, respectively.
  • the first 901a and second 901b optical interleavers respectively include a communication port configured to connect to the bidirectional optical fiber, a first input/output port, and second input/output port.
  • the upstream (up) comb is mapped on even channels of interleaver (IN) 901a and the reflected downstream (R-D) comb is mapped on odd channels of IN 901a.
  • the upstream comb (even) and the R-D comb (odd) come in from the Line West 101a port and IN 901a routes the upstream comb on the even port 903b toward OA 205a; and BiDi amplifier 603 routes the R-D comb on the odd port 903c toward isolator 405b which hinders its propagation.
  • the amplified upstream comb arrives at the even port 903c of IN 901b where it is routed on the communications port 707a and leaves the BiDi amplifier 603 by Line East 101b port.
  • the downstream (down) comb (odd) and the R-U comb (even) come into BiDi amplifier 603 by Line East 101b port where IN 901b routes the downstream comb on odd port 903d toward OA 205b; and BiDi amplifier 603 routes the R- U comb on even port 903c toward isolator 405a which hinders its propagation.
  • the amplified downstream comb arrives at odd port 903a of IN 901a where it is routed on the communications port 703a and leaves BiDi amplifier 603 by Line West 101a port.
  • the BiDi amplifier 603further includes a first optical amplifier 205a positioned between the first input/output ports of the first 901a and the second 901b optical interleavers, respectively, and a second optical amplifier 205b positioned between the second input/output ports of the first and the second optical interleavers, respectively.
  • the BiDi amplifier 603further includes a first isolator 405a positioned between the first input/output port of the first optical interleaver and the first optical amplifier, and a second isolator 405b positioned between the second input/output port of the second optical interleaver and the second optical amplifier.
  • the first optical interleaver 901a is configured to route a wavelength of the upstream channel on the first input/output port of the first optical interleaver towards the first optical amplifier and a reflected downstream wavelength on the second input/output port of the first optical interleaver towards the second isolator.
  • the second optical interleaver 901b is configured to route a wavelength of the downstream channel on the second input/output port of the second optical interleaver towards the second optical amplifier and a reflected upstream wavelength on the first input/output port of the second optical interleaver towards the first isolator.
  • the BiDi amplifier 603 is further configured to amplify the wavelength in the upstream channel with the first optical amplifier 205a and route the amplified upstream wavelength to the communication port of the second optical interleaver 901b.
  • the BiDi amplifier 603, in some embodiments of the OADM, is further configured to amplify the wavelength in the downstream channel with the second optical amplifier 205b and route the amplified downstream wavelength to the communications port of the first optical interleaver 901a.
  • the at least one tunable add-drop component 607 further includes a chain of a first tunable filter 1001a and a second tunable filter 1001b, as illustrated in Figure 10A, for example.
  • a first tunable filter (TF) 1001a can select an added channel and the second TF 1001b can select a dropped channel.
  • the first tunable filter 1001a in some embodiments of the OADM, is configured to select the assigned wavelength from the upstream channel to add and the second tunable filter is configured to select the defined wavelength from the downstream channel to drop.
  • First TF 1001 in the chain includes a three- port structure to allow the passthrough for wavelengths not filtered toward the second TF 1001b.
  • the common add/drop port of the at least one tunable add-drop component 607 is configured to passthrough at least one wavelength not filtered toward the second tunable filter 1001b.
  • T-A/D component 607 is implemented by parallelizing the two tunable filters 1001a, 1001b with a coupling device 1003, as illustrated in the example embodiment of Figure 10B. That is, in another embodiment of the OADM, the at least one tunable add-drop component 607 further includes a first tunable filter 1001a, a second tunable filter 1001b, and a coupling device 1003 positioned in parallel between the first tunable filter and the second tunable filter.
  • coupling device 1003 includes one of a band splitter and an optical interleaver.
  • a band splitter may be used when a network wavelength plan assigns the channels in one direction at one of two sub-bands and the channels in the opposite direction are in the other sub-band. That is, in some embodiments of the OADM, when the coupling device 1003 comprises a band splitter for the upstream channel or the downstream channel, respectively, assigned by the communication network in a first direction in one of a first and a second sub-band and the downstream channel or the upstream channel, respectively, in a second direction that is opposite to the first direction in the other sub-band.
  • an optical interleaver may be used when the channels in the two opposite directions are interleaved.
  • the coupling device 1003 includes an optical interleaver for interleaved upstream and downstream channels on the bi-directional optical fiber.
  • OADM 601 is implemented on a silicon photonic chip, except the optical amplifiers 205a, 205b.
  • the optical amplifiers 205a, 205b are coupled to the silicon photonic chip through external connectors.
  • one of the plurality of the power splitter/combiner ports of the power splitter/combiner 605 includes an express port that is configured to passthrough the downstream and the upstream channels.
  • a bi-directional amplifier (e.g., 603) for a communication network having a bi-directional optical fiber.
  • the bi-directional amplifier includes: a first three-port wavelength selection device (e.g., 701a); and a second three-port wavelength selection device (e.g., 701b).
  • the first and the second three-port wavelength selection devices are respectively configured to route a downstream channel and/or an upstream channel from the bi-directional optical fiber based on a wavelength of the respective downstream channel or upstream channel.
  • a respective one of the first and second wavelength selection devices of the bi-directional amplifier is configured to route a downstream or an upstream channel of a dense wavelength division multiplexing comb based on the wavelength of the channel.
  • the respective first and second wavelength selection devices comprise a first band splitter (e.g., 801a) and a second band splitter (e.g., 801b), respectively.
  • the first and second band splitters respectively include a communications port configured to connect to the bi-directional optical fiber, a first input/output port, and second input/output port.
  • the first and second band splitters are respectively configured to create two paths for wavelengths belonging to a same sub-band including (i) a wavelength in the downstream channel or the upstream channel and (ii) a reflected wavelength from an optical reflection of a signal that travels in a direction opposite the wavelength in the downstream channel or the upstream channel.
  • the bi-directional amplifier further include a first optical amplifier (e.g., 205a) positioned between the first input/output ports of the first (e.g., 801a) and the second (e.g., 801b) band splitters and a second optical amplifier (e.g., 205b) positioned between the second input/output ports of the first (e.g., 801a) and the second (801b) band splitters.
  • a first optical amplifier e.g., 205a
  • the second optical amplifier e.g., 205b
  • the bi-directional amplifier further include a first isolator (e.g., 405a) positioned between the first input/output port of the first band splitter (e.g., 801a) and the first optical amplifier (e.g., 205a), and a second isolator (e.g., 405b) positioned between the second input/output port of the second band splitter (e.g., 801b) and the second optical amplifier (e.g., 205b).
  • a first isolator e.g., 405a
  • the first optical amplifier e.g., 205a
  • a second isolator e.g., 405b
  • the first isolator and the second isolator are configured to hinder propagation of the reflected wavelength.
  • the bi-directional amplifier in some embodiments, is further configured to amplify the wavelength in the upstream channel with the first optical amplifier and route the amplified upstream wavelength to the communication port of the second band splitter.
  • the bi-directional amplifier in some embodiments, is further configured to amplify the wavelength in the downstream channel with the second optical amplifier and route the amplified downstream wavelength to the communications port of the first band splitter.
  • the respective first and second wavelength selection devices when the downstream channel and the upstream channel are interleaved, include a first optical interleaver (e.g., 901a) having a first set of channels for downstream and a second optical interleaver (e.g., 901b) having a second set of channels for upstream, respectively.
  • a first optical interleaver e.g., 901a
  • a second optical interleaver e.g., 901b
  • the first (e.g., 901a) and second (e.g., 901b) optical interleavers respectively include a communication port configured to connect to the bi-directional optical fiber, a first input/output port, and second input/output port.
  • the bi-directional amplifier further includes a first optical amplifier (e.g., 205a) positioned between the first input/output ports of the first (e.g., 901a) and the second (e.g., 901b) optical interleavers, respectively, and a second optical amplifier (e.g., 205b) positioned between the second input/output ports of the first and the second optical interleavers, respectively.
  • a first optical amplifier e.g., 205a
  • second optical amplifier e.g., 205b
  • the bi-directional amplifier further includes a first isolator (e.g., 405a) positioned between the first input/output port of the first optical interleaver and the first optical amplifier, and a second isolator (e.g., 405b) positioned between the second input/output port of the second optical interleaver and the second optical amplifier.
  • the first optical interleaver e.g., 901a
  • the first optical interleaver is configured to route a wavelength of the upstream channel on the first input/output port of the first optical interleaver towards the first optical amplifier and a reflected downstream wavelength on the second input/output port of the first optical interleaver towards the second isolator.
  • the second optical interleaver (e.g., 901b) is configured to route a wavelength of the downstream channel on the second input/output port of the second optical interleaver towards the second optical amplifier and a reflected upstream wavelength on the first input/output port of the second optical interleaver towards the first isolator.
  • the bi-directional amplifier in some embodiments, is further configured to amplify the wavelength in the upstream channel with the first optical amplifier (e.g., 205a) and route the amplified upstream wavelength to the communication port of the second optical interleaver (e.g., 901b).
  • the bi-directional amplifier in some embodiments, is further configured to amplify the wavelength in the downstream channel with the second optical amplifier (e.g., 205b) and route the amplified downstream wavelength to the communications port of the first optical interleaver (e.g., 901a).
  • the terms “comprise”, “comprising”, “comprises”, “include”, “including”, “includes”, “have”, “has”, “having”, or variants thereof are open-ended, and include one or more stated features, integers, elements, steps, components or functions but does not preclude the presence or addition of one or more other features, integers, elements, steps, components, functions or groups thereof.
  • the common abbreviation “e.g.”, which derives from the Latin phrase “exempli gratia” may be used to introduce or specify a general example or examples of a previously mentioned item, and is not intended to be limiting of such item.
  • the common abbreviation “i.e.”, which derives from the Latin phrase “id est,” may be used to specify a particular item from a more general recitation.
  • Example embodiments are described herein with reference to block diagrams and/or flowchart illustrations of computer-implemented methods, apparatus (systems and/or devices) and/or computer program products. It is understood that a block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions that are performed by one or more computer circuits.
  • These computer program instructions may be provided to a processor circuit of a general purpose computer circuit, special purpose computer circuit, and/or other programmable data processing circuit to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, transform and control transistors, values stored in memory locations, and other hardware components within such circuitry to implement the functions/acts specified in the block diagrams and/or flowchart block or blocks, and thereby create means (functionality) and/or structure for implementing the functions/acts specified in the block diagrams and/or flowchart block(s).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un OADM programmable (601) pour un réseau de communication ayant une fibre optique bidirectionnelle. L'OADM comprend un amplificateur bidirectionnel (603) comprenant des premier (701a) et second (701b) dispositifs de sélection de longueur d'onde à trois ports configurés pour acheminer un canal aval et/ou un canal amont sur la base d'une longueur d'onde du canal aval ou du canal amont. L'OADM comprend en outre un diviseur/combineur de puissance (605) ayant (i) un port commun et (ii) une pluralité de ports de diviseur/combineur de puissance. L'OADM comprend en outre au moins un composant d'insertion-extraction accordable (607) comprenant un port d'insertion/extraction commun, un port d'extraction configuré pour extraire une longueur d'onde définie à partir du canal en aval appliqué au port d'insertion/extraction commun, et un port d'insertion configuré pour insérer dans le port d'insertion/extraction commun une longueur d'onde attribuée à partir du canal en amont lorsque le canal en amont est appliqué au port d'insertion. Un amplificateur bidirectionnel (603) est également décrit.
PCT/EP2023/064724 2022-06-02 2023-06-01 Multiplexeur optique programmable à insertion-extraction pour réseau de communication à filtre optique bidirectionnel WO2023232960A1 (fr)

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Citations (5)

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Publication number Priority date Publication date Assignee Title
US5604627A (en) * 1995-05-18 1997-02-18 Robert Bosch Gmbh Optical amplifier device
US5689594A (en) * 1995-12-29 1997-11-18 Mci Communications Corp. Multiple wavelength bidirectional lightwave amplifier
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WO2002065679A1 (fr) * 2001-02-13 2002-08-22 Seneca Networks, Inc. Reseau de communication optique wdm bidirectionnel
US20020118446A1 (en) * 2001-02-23 2002-08-29 Chang-Hee Lee Bi-directional optical-amplifier module

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US5604627A (en) * 1995-05-18 1997-02-18 Robert Bosch Gmbh Optical amplifier device
US5689594A (en) * 1995-12-29 1997-11-18 Mci Communications Corp. Multiple wavelength bidirectional lightwave amplifier
US20020039212A1 (en) * 2000-10-04 2002-04-04 Lee Chang Hee Bidirectional add/drop multiplexer and bidirectional add/ drop amplifier module for band-split bidirectional networks
WO2002065679A1 (fr) * 2001-02-13 2002-08-22 Seneca Networks, Inc. Reseau de communication optique wdm bidirectionnel
US20020118446A1 (en) * 2001-02-23 2002-08-29 Chang-Hee Lee Bi-directional optical-amplifier module

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F. TESTA ET AL.: "Integrated Reconfigurable Silicon Photonics Switch Matrix in IRIS Project: Technological Achievements and Experimental Results", IN JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 37, no. 2, 15 January 2019 (2019-01-15), pages 345 - 355, XP011710904, DOI: 10.1109/JLT.2018.2871974

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