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A Symmetric-Rate, Extended-Reach 40Gb/s CWDM-TDMA PON with Downstream and Upstream SOA-Raman Amplification
Kenneth Reichmann, Patrick Iannone
Journal of Lightwave Technology,
2012.
[PDF]
[BIB]
IEEE Copyright
This version of the work is reprinted here with permission of IEEE for your personal use. Not for redistribution. The definitive version was published in Journal of Lightwave Technology. , Volume 30, Issue 4, 2012-02-15
{We demonstrate an extended reach 60-km CWDM-TDMA PON with 40 Gb/s capacity for both down and upstream directions. The system leverages existing 10 Gb/s TDMA PON technologies and incorporates various subsystems such as volume manufacturable optical transmitters, a prototype 10-Gb/s burst-mode receiver, hybrid SOA-Raman amplifiers, and a cyclic CWDM multiplexer. We confirm that this 32-user system has sufficient power margin to accommodate 128 users.}
Research Highlights: Optical Systems Research at AT&T Labs
Martin Birk, Mikhail Brodsky, Mark Feuer, Patrick Iannone, Peter Magill, Jonathan Nagel, Lynn Nelson, Kenneth Reichmann, Sheryl Woodward, Xiang Zhou
IEEE Photonics Newsletter,
2011.
[PDF]
[BIB]
IEEE Copyright
This version of the work is reprinted here with permission of IEEE for your personal use. Not for redistribution. The definitive version was published in IEEE Photonics Newsletter. , 2011-07-01
{}
Optical Access Beyond 10 Gb/s PON
Patrick Iannone, Kenneth Reichmann
European Conference on Optical Communications 2010,
2010.
[BIB]
{Innovation in optical access network architectures has always been tightly coupled to innovation in enabling components and subsystems. We explore some of the candidate architectures for next-generation optical access with an emphasis on enabling technologies.}
Method And Apparatus For Enabling Multiple Passive Optical Networks To Share One Or More Sources,
Tue Jul 17 12:52:53 EDT 2012
A method and apparatus for implementing a hybrid SOA-Raman amplifier in a central office in order to enable multiple passive optical networks to share one or more enhancement service sources, e.g., to share a source for a broadcast service are disclosed.
Method And Apparatus For Enabling Multiple Optical Line Termination Devices To Share A Feeder Fiber,
Tue Mar 20 19:01:48 EDT 2012
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Method, Apparatus And System For Minimally Intrusive Fiber Identification,
Tue Sep 20 16:06:09 EDT 2011
A method, apparatus and system for minimally intrusive fiber identification includes imparting a time-varying modulation onto an optical signal propagating in an optical fiber and subsequently detecting the presence of the time-varying modulation in the optical signal transmitting through the fiber to identify the fiber. In a specific embodiment of the invention, a time-varying curvature is imposed on the fiber to be identified and the presence of the resultant time variation in the transmitted power of a propagating optical signal is subsequently detected for identification of the manipulated fiber.
Method And Apparatus For Blocking Ambient Light In A Live Fiber Optic Identifying Device,
Tue Aug 23 16:06:02 EDT 2011
Spurious light is prevented from entering a cover of an optical fiber identification device by placing an opaque, flexible medium such as brush bristles within optical fiber clearance openings in the cover to block the light path around the fiber. Short opposing lengths of strip brushes are placing on either side of each of the slot openings in the cap. The opposing bristles make contact with each other in the slot, keeping out most ambient light. The strip brushes exert very little force on the fiber, permitting it to bend freely.
System For Flexible Multiple Broadcast Service Delivery Over A WDM Passive Optical Network Based On
RF Block-Conversion Of RF Service Bands Within Wavelength Bands,
Tue Dec 28 15:05:26 EST 2010
A system and method for simultaneous delivery of a plurality of independent blocks of 500 MHz digital broadcast television services, stacking a plurality of RF blocks on a plurality of spectrally sliced WDM optical bands. The method for delivering a plurality of video blocks to a user terminal serviced by a remote node comprises the steps of receiving, by a first WDM, a broadband signal from a broadband signal source, separating, by the first WDM, the broadband signal into a plurality of optical hands, modulating each of the plurality of optical bands with a composite signal representing data in a plurality of independent RF blocks to form a plurality of modulated signals, forwarding the plurality of modulated signals to a second WDM to form a combined broadcast signal, transmitting the combined broadcast signal over feeder fiber to a remote node, selecting a RF block for distribution over a distribution fiber to a conventional satellite set-top box at a user's site and forwarding the selected RF block to the user's site. A novel method and system for reducing spontaneous beat noise is also described.
Method For Operating Transparent Node For WDM Shared "Virtual Ring" Networks,
Tue Nov 30 15:05:06 EST 2010
A system and method for a transparent WDM metro ring architecture in which optics enables simultaneous provisioning of dedicated wavelengths for high-end user terminals, while low-end user terminals share wavelengths on "virtual rings". All wavelengths are sourced by the network and remotely modulated at customer "End Stations" by low cost semiconductor optical amplifiers, which also serve as transmission amplifiers. The transparent WDM metro ring architecture permits the communication of information and comprises a fiber optical feeder ring, at least one fiber optical distribution ring, a network node (NN), at least one access node (AN) said network node and said at least one access node connected via said fiber optical feeder ring and at least one end station (ES) connected via said fiber optical distribution ring to said at least one access node, wherein said user is attached to said at least one end station. A simple node that supports bi-directional propagation in transparent WDM metro architectures using "virtual rings" is also described. A method for communicating information over a WDM fiber optical ring network architecture in a metro access arena using one or more wavelengths, which can be shared by a plurality of user terminals, each user terminal coupled to an end station comprises the steps of sending downstream data packets, sending optical chalkboard packets consisting of ones and sending control signals.
Multi-Band Hybrid SOA-Raman Amplifer For CWDM,
Tue Jun 29 15:04:08 EDT 2010
A multi-band hybrid amplifier is disclosed for use in optical fiber systems. The amplifier uses Raman laser pumps and semiconductor optical amplifiers in series to produce a relatively level gain across the frequency range of interest. Multiple Raman pumps are multiplexed before coupling into the fiber. The Raman amplified optical signal may be demultiplexed and separately amplified by the SOAs before re-multiplexing. Gain profiles of the Raman pumps and the SOAs are selected to compensate for gain tilt and to alleviate the power penalty due to cross-gain modulation in the SOAs. The disclosed hybrid amplifier is especially useful in coarse wavelength division multiplexing (CWDM) systems.
Multi-Band Hybrid SOA-Raman Amplifer For CWDM,
Tue Jun 15 15:04:02 EDT 2010
A multi-band hybrid amplifier is disclosed for use in optical fiber systems. The amplifier uses Raman laser pumps and semiconductor optical amplifiers in series to produce a relatively level gain across the frequency range of interest. Multiple Raman pumps are multiplexed before coupling into the fiber. The Raman amplified optical signal may be demultiplexed and separately amplified by the SOAs before re-multiplexing. Gain profiles of the Raman pumps and the SOAs are selected to compensate for gain tilt and to alleviate the power penalty due to cross-gain modulation in the SOAs. The disclosed hybrid amplifier is especially useful in coarse wavelength division multiplexing (CWDM) systems.
Method For Flexible Multiple Broadcast Service Delivery Over A WDM Passive Optical Network Based On RF Block-Conversion Of RF Service Bands Within Wavelength Bands,
Tue May 25 15:03:54 EDT 2010
A system and method for simultaneous delivery of a plurality of independent blocks of 500 MHz digital broadcast television services, stacking a plurality of RF blocks on a plurality of spectrally sliced WDM optical bands. The method for delivering a plurality of video blocks to a user terminal serviced by a remote node comprises the steps of receiving, by a first WDM, a broadband signal from a broadband signal source, separating, by said first WDM, said broadband signal into a plurality of optical bands, modulating each of the plurality of optical bands with a composite signal representing data in a plurality of independent RF blocks to form a plurality of modulated signals, forwarding said plurality of modulated signals to a second WDM to form a combined broadcast signal, transmitting said combined broadcast signal over feeder fiber to a remote node, selecting a RF block for distribution over a distribution fiber to a conventional satellite set-up box at a user's site and forwarding said selected RF block to said user's site. A novel method and system for reducing spontaneous beat noise is also described.
Multi-Band Hybrid SOA-Raman Amplifer For CWDM,
Tue Dec 01 16:08:22 EST 2009
A multi-band hybrid amplifier is disclosed for use in optical fiber systems. The amplifier uses Raman laser pumps and semiconductor optical amplifiers in series to produce a relatively level gain across the frequency range of interest. Multiple Raman pumps are multiplexed before coupling into the fiber. The Raman amplified optical signal may be demultiplexed and separately amplified by the SOAs before remultiplexing. Gain profiles of the Raman pumps and the SOAs are selected to compensate for gain tilt and to alleviate the power penalty due to cross-gain modulation in the SOAs. The disclosed hybrid amplifier is especially useful in coarse wavelength division multiplexing (CWDM) systems.
Multi-Band Amplifier Based On Discrete SOA-Raman Amplifiers,
Tue Jul 28 16:07:46 EDT 2009
Several discrete hybrid amplifiers are used in parallel for amplifying an optical signal in an optical fiber system. An optical signal is first split into two or more separate signals each with a separate wavelength band. Each wavelength band is then amplified by a Raman pump utilizing a length of highly non-linear fiber as the gain medium, and by an SOA amplifier. The combination of the Raman amplifier and the SOA yields a level gain over the wavelength band. The amplified wavelength band signals are then recombined. The disclosed amplifier is especially useful in coarse wavelength division multiplexing (CWDM) systems and in local access portions of the network.
System for flexible multiple broadcast service delivery over a WDM passive optical network based on RF block-conversion, of RF service bands within wavelength bands,
Tue Dec 16 18:13:19 EST 2008
A system and method for simultaneous delivery of a plurality of independent blocks of 500 MHz digital broadcast television services, stacking a plurality of RF blocks on a plurality of spectrally sliced WDM optical bands. The method for delivering a plurality of video blocks to a user terminal serviced by a remote node comprises the steps of receiving, by a first WDM, a broadband signal from a broadband signal source, separating, by the first WDM, the broadband signal into a plurality of optical bands, modulating each of the plurality of optical bands with a composite signal representing data in a plurality of independent RF modulated signals to form a plurality of modulated signals, forwarding the plurality of modulated signals to a second WDM to form a combined broadcast signal, transmitting the combined broadcast signal over feeder fiber to a remote node, selecting a RF block for distribution over a distribution fiber to a conventional satellite set-to box at a user's site and forwarding the selected RF block to the user's site. A novel method and system for reducing spontaneous beat noise is also disclosed.
Multi-band hybrid SOA-raman amplifier for CWDM,
Tue Dec 09 18:13:18 EST 2008
A multi-band hybrid amplifier is disclosed for use in optical fiber systems. The amplifier uses Raman laser pumps and semiconductor optical amplifiers in series to produce a relatively level gain across the frequency range of interest. Multiple Raman pumps are multiplexed before coupling into the fiber. The Raman amplified optical signal may be demultiplexed and separately amplified by the SOAs before re-multiplexing. Gain profiles of the Raman pumps and the SOAs are selected to compensate for gain tilt and to alleviate the power penalty due to cross-gain modulation in the SOAs. The disclosed hybrid amplifier is especially useful in coarse wavelength division multiplexing (CWDM) systems.
System for transparent node for WDM shared "virtual ring" networks,
Tue Nov 11 18:13:10 EST 2008
A system and method for a transparent WDM metro ring architecture in which optics enables simultaneous provisioning of dedicated wavelengths for high-end user terminals, while low-end user terminals share wavelengths on virtual rings. All wavelengths are sourced by the network and remotely modulated at customer End Stations by low cost semiconductor optical amplifiers, which also serve as transmission amplifiers. The transparent WDM metro ring architecture permits the communication of information and comprises a fiber optical feeder ring, at least one fiber optical distribution ring, a network node (NN), at least one access node (AN) said network node and said at least one access node connected via said fiber optical feeder ring and at least one end station (ES) connected via said fiber optical distribution ring to said at least one access node, wherein said user is attached to said at least one end station. A simple node that supports bi-directional propagation in transparent WDM metro architectures using virtual rings is also described. A method for communicating information over a WDM fiber optical ring network architecture in a metro access arena using one or more wavelengths, which can be shared by a plurality of user terminals, each user terminal coupled to an end station comprises the steps of sending downstream data packets, sending optical chalkboard packets consisting of ones and sending control signals.
Method for operating transparent node for WDM shared `virtual ring` networks,
Tue Nov 11 18:13:10 EST 2008
A system and method for a transparent WDM metro ring architecture in which optics enables simultaneous provisioning of dedicated wavelengths for high-end user terminals, while low-end user terminals share wavelengths on virtual rings. All wavelengths are sourced by the network and remotely modulated at customer End Stations by low cost semiconductor optical amplifiers, which also serve as transmission amplifiers. The transparent WDM metro ring architecture permits the communication of information and comprises a fiber optical feeder ring, at least one fiber optical distribution ring, a network node (NN), at least one access node (AN) said network node and said at least one access node connected via said fiber optical feeder ring and at least one end station (ES) connected via said fiber optical distribution ring to said at least one access node, wherein said user is attached to said at least one end station. A simple node that supports bi-directional propagation in transparent WDM metro architectures using virtual rings is also described. A method for communicating information over a WDM fiber optical ring network architecture in a metro access arena using one or more wavelengths, which can be shared by a plurality of user terminals, each user terminal coupled to an end station comprises the steps of sending downstream data packets, sending optical chalkboard packets consisting of ones and sending control signals.
Multi-band hybrid SOA-raman amplifier for CWDM,
Tue Mar 11 18:12:40 EDT 2008
A multi-band hybrid amplifier is disclosed for use in optical fiber systems. The amplifier uses Raman laser pumps and semiconductor optical amplifiers in series to produce a relatively level gain across the frequency range of interest. Multiple Raman pumps are multiplexed before coupling into the fiber. The Raman amplified optical signal may be demultiplexed and separately amplified by the SOAs before re-multiplexing. Gain profiles of the Raman pumps and the SOAs are selected to compensate for gain tilt and to alleviate the power penalty due to cross-gain modulation in the SOAs. The disclosed hybrid amplifier is especially useful in coarse wavelength division multiplexing (CWDM) systems.
System for transparent node for WDM shared "virtual ring" networks,
Tue Jan 15 18:12:33 EST 2008
A system and method for a transparent WDM metro ring architecture in which optics enables simultaneous provisioning of dedicated wavelengths for high-end user terminals, while low-end user terminals share wavelengths on virtual rings. All wavelengths are sourced by the network and remotely modulated at customer End Stations by low cost semiconductor optical amplifiers, which also serve as transmission amplifiers. The transparent WDM metro ring architecture permits the communication of information and comprises a fiber optical feeder ring, at least one fiber optical distribution ring, a network node (NN), at least one access node (AN) said network node and said at least one access node connected via said fiber optical feeder ring and at least one end station (ES) connected via said fiber optical distribution ring to said at least one access node, wherein said user is attached to said at least one end station. A simple node that supports bi-directional propagation in transparent WDM metro architectures using virtual rings is also described. A method for communicating information over a WDM fiber optical ring network architecture in a metro access arena using one or more wavelengths, which can be shared by a plurality of user terminals, each user terminal coupled to an end station comprises the steps of sending downstream data packets, sending optical chalkboard packets consisting of ones and sending control signals.
Method, apparatus and system for minimally intrusive fiber identification,
Tue Oct 16 18:12:18 EDT 2007
A method, apparatus and system for minimally intrusive fiber identification includes imparting a time-varying modulation onto an optical signal propagating in an optical fiber and subsequently detecting the presence of the time-varying modulation in the optical signal transmitting through the fiber to identify the fiber. In a specific embodiment of the invention, a time-varying curvature is imposed on the fiber to be identified and the presence of the resultant time variation in the transmitted power of a propagating optical signal is subsequently detected for identification of the manipulated fiber.
Method for operating transparent node for WDM shared,
Tue Jan 02 18:11:47 EST 2007
A system and method for a transparent WDM metro ring architecture in which optics enables simultaneous provisioning of dedicated wavelengths for high-end user terminals, while low-end user terminals share wavelengths on virtual rings. All wavelengths are sourced by the network and remotely modulated at customer End Stations by low cost semiconductor optical amplifiers, which also serve as transmission amplifiers. The transparent WDM metro ring architecture permits the communication of information and comprises a fiber optical feeder ring, at least one fiber optical distribution ring, a network node (NN), at least one access node (AN) said network node and said at least one access node connected via said fiber optical feeder ring and at least one end station (ES) connected via said fiber optical distribution ring to said at least one access node, wherein said user is attached to said at least one end station. A simple node that supports bi-directional propagation in transparent WDM metro architectures using virtual rings is also described. A method for communicating information over a WDM fiber optical ring network architecture in a metro access arena using one or more wavelengths, which can be shared by a plurality of user terminals, each user terminal coupled to an end station comprises the steps of sending downstream data packets, sending optical chalkboard packets consisting of ones and sending control signals.
System for flexible multiple broadcast service delivery over a WDM passive optical network based on RF block-conversion of RF service bands within wavelength bands,
Tue Aug 01 18:11:27 EDT 2006
A system and method for simultaneous delivery of a plurality of independent blocks of 500 MHz digital broadcast television services, stacking a plurality of RF blocks on a plurality of spectrally sliced WDM optical bands. The method for delivering a plurality of video blocks to a user terminal serviced by a remote node comprises the steps of receiving, by a first WDM, a broadband signal from a broadband signal source, separating, by the first WDM, the broadband signal into a plurality of optical bands, modulating each of the plurality of optical bands with a composite signal representing data in a plurality of independent RF blocks to form a plurality of modulated signals, forwarding the plurality of modulated signals to a second WDM to form a combined broadcast signal, transmitting the combined broadcast signal over feeder fiber to a remote node, selecting a RF block for distribution over a distribution fiber to a conventional satellite set-up box at a user's site and forwarding the selected RF block to the user's site. A novel method and system for reducing spontaneous beat noise is also disclosed.
Fault location apparatus and procedures in CWDM business applications using wavelength selective OTDR,
Tue May 09 18:11:11 EDT 2006
A method for verifying fiber connections and diagnosing loss of light or loss of signal conditions in a WDM optical system. The method utilizes an optical time domain reflectometer (OTDR) having user-selectable wavelengths to shoot OTDR traces at a specified wavelength corresponding to an optical data-bearing channel into a selected one of a plurality of optical fiber transmission lines that are connected to a multiplexer that respectively multiplexes a data bearing channel carried on each of the plurality of optical fiber transmission lines onto a trunk, or a demultiplexer that demultiplexes multiplexed data bearing channels from the trunk. The OTDR receives backscattered light from the selected optical fiber transmission line and generates a trace of the backscattered light, thereby enabling a fault location in the WDM optical system to be determined from the trace.
System for transparent node for WDM shared "virtual ring" networks,
Tue Feb 28 18:10:57 EST 2006
A system and method for a transparent WDM metro ring architecture in which optics enables simultaneous provisioning of dedicated wavelengths for high-end user terminals, while low-end user terminals share wavelengths on virtual rings. All wavelengths are sourced by the network and remotely modulated at customer End Stations by low cost semiconductor optical amplifiers, which also serve as transmission amplifiers. The transparent WDM metro ring architecture permits the communication of information and comprises a fiber optical feeder ring, at least one fiber optical distribution ring, a network node (NN), at least one access node (AN) said network node and said at least one access node connected via said fiber optical feeder ring and at least one end station (ES) connected via said fiber optical distribution ring to said at least one access node, wherein said user is attached to said at least one end station. A simple node that supports bi-directional propagation in transparent WDM metro architectures using virtual rings is also described. A method for communicating information over a WDM fiber optical ring network architecture in a metro access arena using one or more wavelengths, which can be shared by a plurality of user terminals, each user terminal coupled to an end station comprises the steps of sending downstream data packets, sending optical chalkboard packets consisting of ones and sending control signals.
Multiple input waveguide grating router for broadcast and multicast services,
Tue Feb 24 18:09:04 EST 2004
An optical telecommunications network suitable for carrying broadcast and switched services. The network includes a wavelength division multiplexing (WDM) coupled to a waveguide grating router (WGR). In accordance with the invention, an adjacent input port is connected with the same optical content. Thus, its outputs are adjacent (or wrapped around). According, the optical power in each of the broadcast bands at the outputs remains the same but is reduced by a factor of two in power for each channel but occupying twice as many channels. This has the effect of increasing the SNR by a factor of two.
Long Reach Delivery Of Broadcast Services Using Broadband Optical Sources And Pre-Compensation Of Dispersion,
Tue Jun 10 18:08:43 EDT 2003
A broadcast delivery system allows the delivery of broadband broadcast services over a WDM Passive Optical Network. These broadband services can be carried on optical broadband carriers or signals in a cost-effective manner by utilizing shared dispersion-compensated fiber (DCF) over a group of feeder lines or a group of PONs. A broadband optical signal is provided over a plurality of feeder lines. Each feeder line is connected to a remote node for distribution to subscribers. One dispersion-compensated fiber is shared for a plurality of feeder lines.
Optical transmission system and method using an optical carrier drop/add transceiver,
Tue Oct 15 18:08:30 EDT 2002
An optical carrier drop/add transmission system and method using a same optical carrier to both drop traffic from an optical network and to add traffic to the optical network. An optical carrier signal is received by a transceiver and is subsequently split into a first and second optical signal. The first optical signal can be converted into an electrical signal for processing by the subscriber (i.e., data out). The electrical signal corresponding to the first optical signal is additionally inverted by the transceiver. The inverted electrical signal is subsequently modulated with the second optical signal in order to create a nominally flat signal (optical chalkboard). The subscriber's data is then modulated onto the flat signal and sent across the optical network. As a consequence, the network subscriber controls the format and protocols of the data traffic on the optical network, while the optical network service provider controls the optical carrier wavelengths, which are of primary concern to maintain organization and efficiency on the optical network.
Passive optical network using a fabry-perot laser as a multiwavelength source,
Tue Apr 30 18:07:54 EDT 2002
A passive optical network (PON) comprises an optical device for producing light at a plurality of optical frequencies, an optical receiver for receiving light produced by the optical device, and a wavelength division multiplexer for transmitting the light produced by the optical device to the optical receiver, the wavelength division multiplexer having passbands centered at respective center frequencies, the center frequencies being different than the optical frequencies.
Simultaneous wavelength-division multiplexing and broadcast transmission system,
Tue Aug 07 18:07:12 EDT 2001
A system for simultaneously transmitting multifrequency signals including a laser light source having a shared gain section and an addressable gain section. A first group of signals modulating the addressable gain section of the laser produces a plurality of wavelength division multiplexed channels. The second group of signals modulates the shared gain section of the laser such that each of the multiplexed channels is modulated with the signals from the second group.
Simultaneous wavelength-division multiplexing and broadcast transmission system,
Tue Nov 14 18:06:54 EST 2000
A system for simultaneously transmitting multifrequency signals including a laser light source having a shared gain section and an addressable gain section. A first group of signals modulating the addressable gain section of the laser produces a plurality of wavelength division multiplexed channels. The second group of signals modulates the shared gain section of the laser such that each of the multiplexed channels is modulated with the signals from the second group.
IEEE Fellow, 2008.
For contributions to network architectures and enabling technologies for fiber access.
