Sharing of Spectrum and Alien Waves in and around SURFnet. London CBF and Brussels Photonic Exchange. Time and Frequency Transfer in SURFnet s network

Transcription

1 Sharing of Spectrum and Alien Waves in and around SURFnet 3RD TERENA ARCHITECT WORKSHOP Rob Smets Architect Transport and Light Systems Outline London CBF and Brussels Photonic Exchange Time and Frequency Transfer in SURFnet s network 100G Alien waves for customers Multi-domain alien-wave demand planning rules Infinera waves on a Ciena light system Guy Roberts from GEANT Association (Some of these slides have been presented at CEF2014 Prague) 1

2 London CBF / Brussels Photonic Exchange Amsterdam London CBF Joint Collaboration between NORDUnet and SURFnet Collaboration: NORDUnet leases the fiber, SURFnet installs and operates the light system. We start with two 100G waves. CBF between ASD001A ASD002A LDN001A For SURFnet puts total number of CBFs to four (Geneva, Hamburg, London, Aachen) Puts total number of foreign PoPs to six. Driven by desire to connect to services in London directly Installation took place in September 2013 during ECOC 2013 Has been in service since December Expected doubling of 100G services in one year. 2

3 Amsterdam London CBF in more detail London (HEX) Whickford Wherstead Leiston 6500 WL3 Alien 78km 17dB/18.2dB 79km 17.9dB/18.2dB 47km 10.3dB/13.5dB 215km 40.6dB/20.3 db IL RAMAN (RX+TX) = 5.4dB Total IL = 46dB Gain RAMAN: 25.7dB (Ppump=2.88W, Pseed=18mW) 6500 WL3 10km + 10dB 2.4dB/13.5dB 53km 12.8dB/14.8dB Alien Amsterdam WL3 Amsterdam 2 Zandvoort Photonic Exchange in Brussels Amsterdam PoP Hamburg PoP London PoP NORDUnet PoP PoP Brussels SURFnet Paris PoP Geneva PoP 3

4 Why and how? Use cases: Restoration Redundancy For both customer and non-customer facing services Requirements: Support >10Gbps 50GHz ITU grid / 88 channels (all DWDM channels in the C-band) Switch from and to any direction Local add/drop All waves should be presented in a single fiber Concept Datacenter SURFnet To ASD SURFnet OSI_1 To LON NORDUnet OSI_1 EDFA MLA MLA WSS WSS Local Add/Drop WSS-DIA MLA BMD2 CMD44 Datacenter NORDUnet WSS Ca. 10 Km NDSF + patching: 7dB (max) MLA WSS-DIA Local Add/Drop WSS MLA MLA To GEN SURFnet OSI_2 Virtual BMD2 & CMD44s (Derived Adj.) To HB NORDUnet OSI_2 Line fiber (0 km) + padding 4

5 Restoration using OPS switches London Amsterdam 2 Amsterdam TOADM ROADM 6500 OPS TOADM Ch. 28 Gr. 3 (50 GHz) OCLD ASD-LON link add/ Ch. 68 OCLD OPS drop Ch. 68 Gr. 7 OPS OCLD add/drop WSS Gr. 3 Gr. 3 Ch. 28 Ch. 28 add/drop OPS 6500 OCLD Ch. 68 add/drop ROADM WSS (50GHz) BRU-ASD link To/from Hamburg Ch. 28 add/ Ch. 68 drop 6500/CPL LON-BRU link DIA ROADM (50GHz) DIA BRU001A_CPL1P ROADM (50GHz) To/from Geneva Brussels - NORDUnet Brussels - SURFnet Time and Frequency Transfer 5

6 13/11/14 Time and Frequency Transfer in SURFnet Objective: Allow clocks to synchronize their time with an accuracy better than 500ps Two approaches that allow the far end to be compensated for the offset to the middle of a loop: Maintain unidirectional traffic and calibrate the system to compensate for the asymmetry due to different length of each fiber in the fiber pair Implement bi-directional transmission and amplification on a single fiber and only calibrate the time difference occurring in the amplifier and in fiber due to dispersion. SURFnet aims to make adjustments to the network that allows institutions to deploy White Rabbit systems beyond 10km. Semiconductor Optical Amplifiers 1470nm In: 1490nm Out: 1470nm In: 1470nm Out: 1490nm 1490nm LEDN001A_BIDIRAMP_01 (BDOA100B901) 1490nm In: 1470nm Out: 1490nm In: 1490nm Out: 1470nm 1470nm LEDN001A_BIDIRAMP_02 (BDOA100B902) 6

7 Experimental setup over dark fiber In 2013 we have started with the following set-up: VSL-Delft (Dutch Metrology Institute) M S 1dB -1.0dBm 5km G dB -24.0dBm Campus TU-Delft / DT001B 3.4dB -17.3dBm 35.5km G dB -7.7dBm LEDN001A 1.7dBm -26.7dBm ΔT M S 135km, mixed G.655/G.652 fiber 1dB -1.0dBm 0.5km G dB -24.0dBm 1.4dB ASD001A (SARA) NIKHEF-Amsterdam (National Institute for Subatomic Physics) 19dB 14km G dB 0.8dB ASD002A (TC2) 81km G dB Findings: BiDi amplifiers are placed asymmetrical in the link. Link engineering becomes significantly more complex in the absence of sim-tooling Gain of SOAs difficult to control by changing the electrical pump current Amplifiers produce about 19dB of gain on 1470nm and 1490nm Compatibility with fiber infrastructure is good. There are two types of optical budget: too much and too little! Initial tests showed a positive budget of 0.1dB on worst link and wavelength combination After cleaning a positive budget of 2.0 to 3.5 db exists Total budget equals: 20dB + P TX S RX = db depending on transceiver combinations. Total losses equal: 17.3dB between Delft and Leiden and 26.7dB between Amsterdam and Leiden sites. Both slaves lock Round trip delay of 668,981,165ps corresponds to 136km of fiber (272km round trip). Frequency offset of -0.3*10-13 Hz/Hz with a spread of 6*10-13 Hz/Hz over several hours. 12 digit accuracy of the frequency already present. On-going work to calibrate the small difference between 1490nm and 1470nm waves. Measurements are ongoing. We expect to achieve time accuracy around 500ps. 7

8 Press release 100G Alien waves for customers 8

9 Extend DWDM waves into the customer s domain requires a New Demarcation Box: Optical Gate Router Router MGMT MGMT MGMT DWDM TRX TRX OG OG TRX TRX Institution A SURFnet Institution B MGMT Virtualization of the management function Router Router DWDM TRX TRX OG OG TRX TRX Institution A SURFnet Institution B Challenges Optical plane: DWDM signals are transported over an infrastructure that is intended for unengineered links on campus A proper CFP! Cross domain management: Fault Management Configuration Management Accounting Provisioning Security Controlled and accessible by both SURFnet and institutions Optical Gating and Management Information Exchange Functionality may be required to: Isolate and protect the DWDM network Monitoring Measure frequency Test photonic path between two gateways Exchange of management information and instructions (may be virtualized in a datacenter) 9

10 Two Scenario s CPE equipment (router or switch) of both customers is the same: Vendor has DWDM blade in portfolio that interoperates with light system Vendor has DWDM blade in portfolio that does not interoperate with light system Vendor has no DWDM blade in portfolio but does support a CFP slot. CPE equipment (router or switch) of both customers is different: Both CPEs have a CFP slot At least one of the CPEs does not have a CFP slot -> no solution Can we find such a CFP that: Interoperates with SURFnet s DWDM equipment Compatible with Topology of SURFnet7 and SURFnet8 Is affordable! (<$10,000) ACACIA 100G Coherent CFP What if you: optimize power of transmission impairment compensating ASICs; start using 28nm/20nm semiconductor process; start using Silicon Photonics Integrated Circuits and InP chips; pay extreme detail to power consumption and heat management? Source: Flickr Source: Acacia Inc. DWDM single lambda solution 50GHz C-band grid 25ps PMD tolerance & 40 ns/nm CD tolerance Compatible with >1000km network solutions < 15dB OSNR for up to 2000km SD-FEC, HD-FEC <24-26W <7.5W for DSP <7.5W for ADC/DAC/SERDES Ca. 5W for PIC < 10W for misc. funct. 24W for ZR range Path to smaller form factors like CFP2 Supported by hosts 10

11 Multi-domain alien-wave planning Spectrum Sharing on Cross Border Fibers Three important cross-border fibers Amsterdam London Amsterdam Geneva Photonic Exchange in Brussels! Amsterdam Hamburg Photonic Exchanges in Hamburg/Geneva? 11

12 13/11/14 SURFnet s CBFs In operation for several years using a variety of signals GEN & HB CBFs are the CBFS we have the most knowledge on its performance and capabilities 10Gbps with electronic dispersion compensation 40Gbps waves 40Gbps alien waves 100Gbps waves 100Gbps alien waves Non-linearity (is King!) OSNR performance (is King Kong!) Chromatic dispersion and PMD (piece of cake!) Operational issues (escalation matrix and testing of alarms) Can we predict performance impact of an alien wave in order to validate demands end-to-end traversing multiple domains. With reasonable accuracy Without complex, time consuming and expensive high-fidelity simulations Using planning tooling as provided by vendor of light system Fiber Non-Linearity & Dispersion Non-Linearity: No DWDM interfaces that use Back-Scatter-Propagation or other non-linearity compensation. Stick to the linear Gaussian noise model SPM and XPM present themselves as additive Gaussian noise Neighboring channels with different modulations Fixed penalty that adds to OSNR budget Guard channel Dispersion: Chromatic Dispersion: Linear additive PMD: Sum of max. DGDs per domain. 12

13 OSNR validation using FoM Each DWDM interface has a certain OSNR budget. EDFA amplification has matured. Little difference in EDFA behavior of different vendors. Translate multiple-span link to single span, single EDFA link. Each traversed domain is represented by a single span. TX 16dB 17dB 17dB 20dB 23dB 23dB 16dB 13dB 13dB RX L=10*log 10 ( )=23.8dB L=10*log 10 ( )=19dB TX L=10*log 10 ( )=26dB RX Cannot validate this TX RX L=10*log 10 ( )=28.6dB Can validate this TX 25.6dB 25.6dB RX L=10*log 10 ( )=28.6dB Anteneh Beshir, Roeland Nuijts, et.al. Survivable Impairment-Aware Traffic Grooming, Networks and Optical Communications (NOC), th European Conference on Optical Communications Emmanuel Desurvire, Erbium-Doped Fiber Amplifiers: Principles and Applications Example: ASD-GEN and ASD-HB Amplifier nodes 22 ASD-GEN 8 ASD-HB Total length 1500km ASD-GEN 600km ASD-HB 100Gbps PM-QPSK All demands pass! 1.5dB OSNR margin ASD-GEN 6.2dB OSNR margin ASD-HB ASD-GEN: FoM (ASD-GEN) =1910 with 1.5dB margin: FoM (ASD-GEN,max) =2700 FoM (GEN-ASD) =2053 with 1.5dB margin: FoM (GEN-ASD,max) =2900 FoM (avg) =2800 ASD-HB: FoM (ASD-HB) =720 with 6.2dB margin: FoM (ASD-HB) = 3001 FoM (HB-ASD) =775 with6.2db margin: FoM (HB-ASD,max) =3230 FoM (avg) =3115 Average FoM to calculate with is approx. 2960, Difference between GEN & HB CBF = 0.5dB (ROADM filters 2x) 13

14 Infinera waves on a Ciena light system 14