Transcript icton 2008
Reach extension of passive optical networks using semiconductor optical amplifiers A E Kelly, C. Michie, I. Andonovic, J. McGeough, S Kariaganopoulos Standard Passive Optical Networks GPON 1:32 Reach 10-20km Extended Reach Passive Optical Networks Electronic regeneration cannot be used as it results in Preamble erosion due to burst mode locking time Passive Optical Networks 1300nm backhaul Significant ASE levels VOA1 transmitter 1310nm VOA2 SOA 20 nm filter insertion loss α receiver 1310nm •VOA1 represents access loss – split plus some link loss •VOA2 predominately trunk loss •1300 nm and 1.25/2.5 Gbit/s; dispersion neglected Power Budget Simple linear model 2 SNR 2 R Pin tot 2 Pin PIN or APD pin 2 2 SNR IP TOT 2 2 R Pin 2 e ( RP rec I D ) B 4 ( shot noise terms kT RL . receiver Noise Figure ) FN B thermal noise Power Budget 2 Simple linear model SNR 2 R Pin tot 2 Pin PIN or APD APD 2 2 SNR IP TOT 2 2 2 M R Pin 2 eM F A ( RP in I D ) B 4 ( 2 kT RL ) FN B receiver Noise Figure shot noise terms thermal noise APD Multiplication and Noise Factor Power Budget SNR modified to account for ER of transmitter – at best 10 dB Q P AVE 1 0 2 2 1 re 1 re Baseline calculations 1.E-06 -36.00 -34.00 -32.00 -30.00 -28.00 -26.00 1.E-07 data modelled for commercial pin/APD 1.E-05 1.E-08 BER BTB 10dB ER 1.E-06 1.E-09 1.E-07 BTB BTB ER 10 dB BER 1.E-10 1.E-08 1.E-11 Receiver Power, dBm APD Neo Photonics PTB3J88-5638T-SC/PC+ 1.E-09 1.E-10 1.E-11 -30.00 -28.00 -26.00 -24.00 -22.00 Receiver Power, dBm pin – OCP- TRXAG1M -20.00 Inclusion of Amplifier Build upon a model of the SNR to include the noise terms associated with amplifier 1 T S 2 2 2 0 T 2 2 2 ASE 2 ASE S ASE 2 ASE ASE 2 2 ASE ASE Extinction Ratio further degraded due to ASE Significant ASE levels VOA1 transmitter 1310nm Q 20 nm filter PAVE VOA2 SOA 2 1 2 0 insertion loss α receiver 1310nm 1 1 ( P1 PASE ) / PASE 0v APD based Receiver Assumptions – -28 dBm sensitivity for BTB un amplified with 10 dB ER – M=10 – thermal noise estimated to give sensitivity of -28dBm for 10-10 BER (value specified on data sheets) – Psat of SOA +13 dBm – NF 7 dB Amplified APD Receiver 20 nm filter 10 nm filter Baseline 0.8nm filter 1.E-03 1.E-04 1.E-05 1.E-06 BTB infinite ER BTB 10 dB ER 0.8 nm filter 10 nm filter 20 nm filter 20 nm no ER deg BER 1.E-07 20 nm filter ER not considered 1.E-08 1.E-09 1.E-10 1.E-11 1.E-12 1.E-13 -45.00 -40.00 -35.00 Signal Power, dBm -30.00 -25.00 -30.00 10 -31.00 9 -32.00 8 -33.00 7 -34.00 6 -35.00 5 -36.00 4 -37.00 3 Prec pin -38.00 2 Prec APD -39.00 1 pin ext dB APD ext dB -40.00 0 5 10 Optical Filter Bandwidth, nm 15 0 20 Extinction Ratio, dB Receiver Power, dBm ( BER10e-10) Influence of Optical Filtering Post Amplifier Losses Splitter (Access) loss ONT Backhaul SOA insertion loss α 20 nm filter Position amplifier to compensate for splitting and reach losses SOA Psat limited to +13 dBm Gain adjusted accordingly G G max 1 GP in G max OLT receiver 1310nm 40 10 35 9 booster margin 30 8 7 25 6 20 5 mid span margin benefit 15 10 Post Amplifier Loss Unamplified Signal Ppenalty ext dB GPON 5 4 3 2 1 0 Extinction Ratio, Power penalty, dB Loss after amplifier, dB System Power Margins 0 0 5 10 15 20 Loss into Amplifier, dB 25 30 35 pre-amp margin Margin Enhancement for Amplified GPON System Margin Enhancement, dB 30 25 20 15 128 split 10 5 0 0 5 10 15 20 25 Loss into Amplifier, dB 30 35 40 Backhaul Distance, km Distance versus number of users for each case 100 Amplified Reach Unamplified Signal Psat limited 80 Gain limited 60 3264 Split Split 512 Split 40 20 NF limited GPON: 32 split 64128 split split 0 1 10 100 -20 SplitRatio 1000 10000 Experiment VOA 1300 tx VOAl SOA Channel Drop OSA (filter) 1300 nm receiver Experimental Validation 1.E-05 1.E-06 BTB Theory 10 nm theory 20 nm theory 20nm BTB 10 nm BER 1.E-07 1.E-08 1.E-09 1.E-10 -40.00 -38.00 -36.00 -34.00 -32.00 -30.00 -28.00 -26.00 Signal Power, dBm -30 9 -31 8 -32 7 -33 6 -34 5 -35 4 -36 3 -37 2 -38 Prec APD -39 1 Sens APD ext dB -40 0 5 10 Optical Filter Bandwidth, nm 15 0 20 Extinction Ratio, dB Receiver Power, dBm ( BER10e-10) Constant BER curve with filter width Experimental Margin Enhancement Loss Post Amp Theory Loss Post Amp Expt Unamplified P BER10-9 EXPT P 10-9 theory 50 Post Amplifier Margin, dB 40 0 -5 -10 30 20 -15 10 -20 0 0 5 10 15 20 25 30 35 -25 -10 -30 -20 -30 -35 Loss into Amplifier, dB Power at Receiver, dBm 60 Conclusions • Number of users and backhaul distance can be considerably increased by using SOA based amplification • Required SOA specification depends on placement within network • A single SOA cannot meet these requirements • Variable gain clamping schemes? Key Publications Russell P. Davey, Daniel B. Grossman, Michael Rasztovits-Wiech, David B. Payne, Derek Nesset, A. E. Kelly, Albert Rafel, Shamil Appathurai, and Sheng-Hui Yang “Long-Reach Passive Optical Networks” Journal of Lightwave Technology, Vol. 27, Issue 3, pp. 273-291 February 2009 (invited tutorial paper) High Performance Semiconductor Optical Amplifier Modules at 1300nm”A.E.Kelly, C.Michie, I.Armstrong, I.Andonovic, C. Tombling, J.McGeough and B.C.Thomsen, Photon.Tech.Lett, Vol.18, No.24, pp 2674-2676, 2006 “The Dynamic Gain Modulation Performance of Adjustable Gain-Clamped Semiconductor Optical Amplifiers (AGC-SOA)” Liu, L. Michie, C. Kelly, A. E. Andonovic, I., Journal of Lightwave Technology , Volume: 29 Issue: 22 pp 3483 – 3489, 2011.