Advances in Optoelectronic Technologies for ROADM Subsystems
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1 Advances in Optoelectronic Technologies for ROADM Subsystems Louay Eldada Chief Technology Officer DuPont Photonics Technologies
2 Use of ROADM in Optical Networks Long Haul Metro ROADM Used for Connectivity (1x4, 1x8) ROADM Used for Add/Drop (1x5, 1x9, 1x11) Core Access Access Access Optical Switch (OXC) LONG HAUL ACCESS METRO OXC Backbone Network Feeder Ring Network Distribution Network ROADM DEMUX FTTP SPLITTER Consumer 2
3 Migration Toward Agile Optical Networks Optoelectronic functions needed in agile optical networks: Tunable Lasers ROADMs Network Function Justification Compatibility New Components Fixed functions Fixed DWDM lasers, Fixed OADM Narrow tunable laser Inventory reduction Drop-in for fixed laser Thermal-tuned DFB Full-band tunable laser Inventory system simplification Drop-in for fixed transponder External-cavity laser Type I ROADM Limited flexibility Stranded capacity reduction, simple engineering rules Dual-use as DGE λ blocker + fixed filters or Demux/ Switch/Mux PLC Type II ROADM Any λ to any port Degree 2 No manual intervention, monitor & control Retain blocker, add tunable laser, no impact to thru path; or all PLC solution, can be more cost-effective; or WSS Tunable filters/lasers or OXC or WSS Higher-Degree ROADM Any combination of λ s to any port Ring-interconnect w/o OEO Select locations only; interop with other nodes, same lasers WSS Optical Switch (aka OXC) Mesh protection, etc Select locations only Large WSS Autonomous Agility Optimum utilization Minimum OpEx Same physical layer hardware Integrated management 3 RHK (partial)
4 ROADM Use in Networks Market (Technology) Component Vendors System Vendors Carriers (System Suppliers) Long-Haul (Wavelength Blocker) Avanex, JDSU, DuPont, LightConnect Lucent, Ciena, Marconi, Siemens Qwest (Lucent), Verizon (Lucent), GigBE project (Ciena), MCI (Ciena), BT (Marconi), MCI (Siemens), AT&T (Siemens), Broadwing (Corvis) Metro (Wavelength Blocker) Avanex, JDSU, DuPont, LightConnect, CoAdna, Polycromix, Xtellus Alcatel/Tropic, Lucent Verizon, MCI, SBC (Alcatel/Tropic), BellSouth (Tellabs), NTT Metro (Demux/Switch/Mux) JDSU, DuPont, OpTun, Chromux, Neophotonics, NEL Cisco, Tellabs, Hitachi Comcast, Cox, Brighthouse (Fujitsu), Shaw Metro (WSS) JDSU, DuPont, CoAdna, Engana, Metconnex, LichtConnect, Capella Fujitsu, Meriton RHK (partial) About 700 ROADM nodes were deployed in 2004, mostly in the second half of the year The majority of these nodes were 32-channel systems from Fujitsu and Cisco, with the largest deployments being in Japan and North America 4
5 ROADM path lags tunable laser by 2 years Laser ROADM Wide (~40 ch) laser ROADM Higher degree Integrated Demux/ Switch/Mux Moderate (~20 ch) Narrow (~8 ch) laser ROADM Type II Type I Wavelength Selective Switch expected Fixed Source:RHK over 1000 shipped -JDSU 12/01/04 Fixed Blocker + Tunable Filters/Lasers skipped? 5
6 ROADM Types Blocker as DGE Wavelength-Blocker-Based Broadcast and Select Type I Type II Higher-Degree ROADM Blocker Blocker Blocker Blocker EDFA Blocker Splitter Combiner Splitter Combiner Splitter Combiner λ λ λ λ λ λ λ λ Tunable Filters/Rx Tunable Lasers Tunable Filters/Rx Tunable Lasers Fixed Filters Fixed Lasers Type I Integrated Demux/Switch/Mux Type II Higher-Degree ROADM LC- or MEMS-Based WSS Type II or Higher-Degree ROADM Wavelength Selective Switch Combiner Splitter OXC OXC Tunable Lasers Tunable Filters/Rx 6
7 Demux Mux Wavelength-Blocker-Based Type I ROADM Old Generation: Splitters at Drop, Combiners at Add Splitter Wavelength Blocker 1 2 Splitter OPM 1xN (or 1xM) Splitter Tunable Filters New Generation: Demux at Drop, Mux at Add DROP 30%/70% Splitter in Demux Receivers Demux N Wavelength Blocker 1 2 N Mux ADD Transmitters Nx1 (or Mx1) Combiner 30%/70% Splitter Mux Common Characteristics: Free-space (MEMS, LC) For full reconfigurability: Tunable lasers at ADD New Gen: Splitters/Combiners replaced with Demux/Mux No tunable filters at DROP OPM out Drop Channels Add Channels 7
8 PLC-Based Type I ROADM λ 1 λ 2 λ 32 IN D E M U X λ 1 λ 32 5% Tap M U X OUT 15%Tap Control Electronics λ 1 λ 2 λ 32 OUT DEMUX IN λ 1 DROP λ 32 λ 1 λ 32 ADD Power, Data Note: Both express and Add channels are balanced with the built-in VOA array 8
9 Demux Demux WB-Based Broadcast and Select 1xN (or 1xM) Splitter Tunable Filters Type II ROADM Configurations Splitter DROP Receivers Full N (or M of N) Reconfigurability Wavelength Blocker PLC-Based Demux/Switch/Mux 1x2 DCE OCM Mux 2x1 Splitter ADD Tunable Transmitters DCE OCM OCM Nx1 (or Mx1) Combiner Free-space, MEMS, LC Higher IL Difficult to upgrade Reliability issues Tunable filters at DROP For full reconfigurability: Tunable lasers at ADD Large component count Expensive Typical Today: N = 8, 16, 32, 40 M = 4, 8 DROP NxM OXC Receivers ADD MxN OXC Transmitters Mux Can be single PLC Lower IL Easy to upgrade NxM & MxN at A/D give full reconfigurability Integration-friendly Small component count Low cost 9
10 PLC-Based Type II ROADM λ 1 λ 2 λ 32 IN 15%Tap DEMUX D E M U X 5% Tap M U X OUT DROP λ 1 λ 32 32x8 OXC λ 1 λ 32 ADD 8x32 OXC Control Electronics Power, Data Receivers Transmitters 10
11 Demux/Switch/Mux Type II ROADM Fully Reconfigurable East/West Separated Architecture 8 λ / Fiber Drop any λ to any port Add any λ from any port 1 1 Fiber 1 In West DEMUX MUX Fiber 1 Out East Polymer PLC includes 16 1x2 Switches 16 VOA s 16 Taps 16 Photodiodes 2 8x8 Switches 66 Functions Each 8x8 Switch is 112 1x2 Switches 288 Elementary Functions 8 1 8x8 OXC West Chip 8x8 OXC Drop 1 8 From West Add 1 8 To West Add 1 8 To East Drop 1 8 From East x8 OXC East Chip 8x8 OXC 8 1 1x2 Switch Power Tap Photodiode VOA Fiber 2 Out West MUX DEMUX Fiber 2 In East
12 DMux Mux Fully Reconfigurable PLC-Based 8-Channel Demux/Switch/Mux Type II ROADM In (East) Out (East) In (West) Out (West) 1 Switch/VOA Optional Tap/PD 70/30 coupler 2 DMux 8 8x8 Switch x8 Switch Control Electronics DROP (East) ADD (West) Note: Mux and Demux are based on thin film filters 12
13 Node Cascading Simulation Layout Cascade of 16 ROADM nodes (32 AWG s) Simulation tools and assumptions: Rsoft OPTSIM simulation tool is used Measured spectral IL and CD of Flat Top AWG filters are used Two optical amplifiers are used at each node Worst case narrowing of ROADM passband due to temperature variation and center frequency inaccuracy of AWG filters is used 16 iterations 13
14 Bandwidth of Cascading AWG Filters Concatenation of Flat-Top AWG Filters dB BW (GHz) 05-dB BW(GHz) Power (3-dB BW (GHz)) Power (05-dB BW(GHz)) Bandwidth (GHz) y = 79131x y = 50271x Number of Flat-Top AWG Filters 14
15 Simulation Conditions (16 Nodes) Laser center frequency(thz) Demux filter 3-dB center (THz) Mux filter 3-dB center (THz) ROADM Total Loss (db) Run Run Run Run Run 1 Run 2 Run 3 Run 4 15
16 Cascading Simulation Conclusions DuPont PLC ROADM meets bandwidth requirements for 16-node DWDM rings Bandwidth at 05dB is over 40 GHz for each ROADM Bandwidth at 05dB is over 20 GHz after 16 cascading nodes (32 AWG s) DuPont PLC ROADM allows use of low cost, low accuracy lasers for 16- node rings Bit error rate (BER) lower than Lasers with +/-10 shift of center frequency can be used without any system performance degradation after 16 cascading nodes Q Value BER 210E E E E E E E E E Laser Center Frequency (THz) 100E E E E E E E Laser Center Frequency (THz) 16
17 Comparison of PLC and λ Blocker Approaches for ROADM Parameter Number of Channels PLC ROADM 40 λ Blocker ROADM > 40 Channel Spacing 100 GHz < 100 GHz Insertion Loss (in-out) < 12 db < 11 db Insertion Loss (Add-out) < 10 db < 13 db Insertion Loss (in-drop) < 10 db < 10 db Add/Drop Time delay < 10 ms < 50 ms PDL (in-out) at min attenuation < 05 db < 05 db Passband Ripple < 03 db < 03 db Size Two slots Four slots Technology Platform Solid state optics (waveguides) Free space optics Stability and Reliability Excellent Average Cost $X/2 $X Potential for Cost Reduction High automated manufacturing Low manual assembly 17
18 Liquid Crystal & MEMS Based WSS 1xN switches MUX Any number of λ 1-n Out DEMUX 1 2 D2 In Any number of λ 1-n λ 1, λ 2,, λ n-1, λ n D3 n MUX MUX MUX MUX MUX MUX MUX MUX D1 Any number of λ 1-n Any number of λ 1-n D4 Any number of λ 1-n D5 Any number of λ 1-n D6 Any number of λ 1-n D7 Any number of λ 1-n D8 Any number of λ 1-n Shared bulk grating for all Mux s and Demux s JDSU 18
19 Advantages of LC vs MEMS WSS Mature components and proven technology (same technology as wavelength blockers in commercial use) Lower cost (simpler alignment and calibration, high yield) No notches between channels (for higher cascadability and upgradability to smaller channel spacing) Higher reliability (no moving parts) No vibration sensitivity issues No sticking and static damage issues Telcordia qualified technology platform Lower design and supply risk 19
20 Performance of 1x4 Liquid Crystal WSS Typical Interleaved Channel Spectra at Drop Port 20
21 Performance of 1x4 Liquid Crystal WSS Spectra at Different Attenuation Levels 21
22 Optical Crossconnects Use in Mesh Networks Reconfigurable mesh network made up of two interconnected sub-networks, each being an island of transparency OEO Switch OXC at Degree 8 Node OEO Switch Networks today are not simple ring or mesh, they increasingly include: - Ring-mesh hybrids -Stacked rings 22
23 Optical Crossconnects Use in Mesh Networks OXC s are particularly useful in reconfigurable mesh networks where nodes have to route traffic from different directions Important criteria: Non-blocking reconfigurable node Reliable configuration (several medium size switch matrices) Optical properties (IL, XT, etc) No regeneration, no wavelength conversion For N fibers (degree N node) and M wavelengths per fiber, M NxN switches are needed Degree 4 Node for Meshed Architecture 4 Fibers 4x4 Switches 4 λ / Fiber 4 Switches Eurescom P615 From Local Node To Local Node 23
24 Enabling PLC Technologies Polymer Based Integrated Switch-VOA Arrays Add Switch(2x1)/VOA & OXC(8x8, 32x8) Low Loss, Low PDL Low power consumption Wavelength independence Telcordia qualified Silica Based AWG (Mux/Demux) Flat top Low loss Low CD Low PDL Tight center frequency accuracy ( 5 GHz) Wide bandwidth ( 80 GHz at 3 db) Telcordia qualified Planar "Free Space" Coupler 1 2 Inputs Waveguide Delay Lines L = constant N Dummy Guides 1 2 Outputs N 24
25 Chip-to-Chip Integration Chip-to-Chip integration: Eliminates fiber arrays, reducing cost Eliminates space needed for fiber ribbons and splices Eliminates excess loss due to pigtailing Improves reliability due to reduced number of interfaces 8ch fiber array 8ch fiber array Example: 40ch VMUX 8x32 OXC 32x8 OXC fiber Silica-on-Si AWG Polymer Arrays of Switches/ VOA s/ Power Monitors Silica-on-Si AWG fiber Silica AWG fiber Silica-on-Si AWG Silica-on-Si AWG fiber Polymer PLC VOA Array 40ch Fiber Array 8ch fiber array 32x8 OXC 8x32 OXC 8ch fiber array Measured chip-to-chip excess loss: <01dB 25
26 Dynamic IC Fabrication Metalization Polymer Waveguide Fabrication Blank Wafer to Diced Chips in 6 Hours Dicing, Packaging Form 3: Black box with optical and electrical connectors ROAD Form 1: Packaged chip Form 2: Packaged chip on PCB with control electronics and firmware 26
27 DuPont Polymer Photonic IC s Key Properties at 1550 nm Cycle Time Propagation Loss Polarization Effects Minutes/wafer 011 db/cm (sm wg) Birefringence = 10-6 PMD = 001 ps (1 cm sm wg) PDL = 001 db (1 cm sm wg) Dynamic Provisioning dn/dt = -32x10-4 Compactness, Density n = 0-30% Reliability Function Availability Proven Static & Dynamic in Polymer Active by Hybrid Integration Insertion Loss [db] Propagation Loss = 011 db/cm Pigtail Loss = 014 db per side Low Insertion Loss Chip Length [mm] Refractive Index (n) dn/dt = -32x10-4 Low Power Consumption Insertion Loss (db) WDL < 005 db Low Wavelength Dependence Temperature [ C] Wavelength (nm) 27
28 Polymer 1x2 Digital Optical Switches Optical Signal OUT Heater Electrode (ON) ~01 Heater Electrode (OFF) 0 Transfer Curve Bonding Pad Optical Signal IN Channel Waveguide Optical Output (db) 'ON' Arm Output 'OFF' Arm Output Heater Power (mw) Digital Range 28
29 Low Power Polymer MZI VOA 0 Optical Output (db) Attenuation: 30 db Sensitivity: 20 db/mw Max Power Consumption: 15 mw Response Time: 3 ms Heater Power (mw) 29
30 Polymer-Based 8x8 Intelligent OXC Intelligent OXC 8x8 Switch (112 1x2 Switches) + 8 Taps + 8 VOAs Strictly non-blocking OXC Power monitoring Channel balancing Optical Power Tap 1x2 Digital Optical Switch Performance Characteristics Insertion Loss (fiber to fiber): 5 db 0 / 15 db Atten: 01 / 03 db WDL ( nm): 01 db TDL (-5 70 C): 01 db ODL ( dbm): 01 db Extinction: 45 db Crosstalk (any port to any port): 50 db Return Loss: 50 db Power Consumption: 25 W Response Time: 3 ms CD: 01 ps/nm, PMD: 001 ps Variable Optical Attenuator Simple control of switching elements from common drive voltage Total Footprint with PCB: 10 in 2 30
31 Telcordia Qualification Passed GR-1209-CORE/GR-1221-CORE Telcordia Tests GR-1209-CORE/GR-1221-CORE Temperature-Humidity Aging (85 C/85%RH, 336 hours) Temperature Cycling (-40 C to 85 C, 100 cycles) Thermal Shock (0 C to 100 C, 15 cycles) Vibration ( Hz, 3 axes, 4 cycles/axis) Mechanical Shock (500 G, 6 directions, 5 times/direction) High Temperature Storage (85 C, 2000 hours) Lifetest (70 C, 2000 hours, in-situ operation & test) Cable Retention (34 lb load, 1 minute) Fiber Side Pull (05 lb load, 90 angle) Test Result PASS PASS PASS PASS PASS PASS PASS PASS PASS 31
32 Telcordia Qualification Results Number of Channels nm 1550 nm 1565 nm Change in Insertion Loss (db) Passed Telcordia qualification with large margin Narrow data distribution around 0 db IL change Changes are on order of measurement error 32
33 Reliability of Polymers and Devices Highly Accelerated Stress Tests (HAST) Insertion Loss Variation (db) Stability with High Temperature Device 1 Device 2 Device 3 Device C, 5000 Hours, C hours 10-cm-long waveguides (1550 nm) Time (hours) Lifetime > 20 years at maximum operating temperature of 150 C Transmission Variation (db/cm) Stability with High Optical Power 32 dbm (15 W), 6000 hours (1550 nm) Optical intensity in polymer waveguide = 25x10 10 W/m 2 100x optical intensity on the surface of the Sun Duration (hours) 20-year degradation <008dB/cm at 17 dbm input power <002dB/cm at 10 dbm input power Polymer lifetime well over lifetime of other components in system 33
34 Thank You 34
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