Polarization Related Tests for Coherent Detection Systems

Transcription

1 Polarizaion Relaed Tess for Coheren Deecion Sysems Shawn X. Wang, PhD General Phoonics Corporaion Chino, CA, USA Ouline Coheren Deecion Sysem T X processor T X PBC SOP Variaion PMD Variaion PDL Variaion R X PBS 90 hybrid DSP DeMUX algorihm PMDC algorihm PDLC algorihm - Overview of SOP, PMD, and PDL. - Wha o expec from SOP emulaors - Polarizaion orhogonaliy Tes - Long erm polarizaion monioring - Mehods of PMD measuremens - PMD emulaion - Mehods of PDL measuremens - PDL emulaion 2 1

2 Insrumens for Sress Tesing Coheren Deecion Sysem SOP PMD PDL Tracking Speed Tess SOP PMD PDL Recovery Time Tess SOP generaion 1 s order PMD generaion 2 nd order PMD generaion PDL generaion Tolerance Range Tess RX TX DSP DeMUX algorihm PMDC algorihm SOP emulaor PMD emulaor PDL emulaor PDLC algorihm PC BER Teser 3 Sae of Polarizaion Basics Normalized SOP S3 Sokes Vecor S0 S1 SOP S 2 S3 DOP S2 DOP 2 2 S S S 1 S o S1 4 2

3 SOP Measuremen P Signal in P 0 Beam splier P 45 P RHC Normalized SOP DOP S3 S2 QWP Polarizers Deecors S0 P S1 2P0 P SOP S P P S3 2PRHC P S1 DOP 2 2 S S S 1 S o SOP Relaed Tess SOP SOP SOP Tracking Speed Tes SOP Recovery Time Tes TX RX SOP emulaor PMD emulaor PDL emulaor PC BER Teser 6 3

4 Wha o Look for in a SOP Emulaor? 1) Emulae a real fiber SOP 7 Wha o Look for in a SOP Emulaor? 1) Emulae real fiber 2) Speed Generaed by GP s Advanced Polarizaion Conroller π SOP changing rae in a real fiber opic sysem can be as high as 280 krad/s Krummrich and Koen, OFC, ~700 krad/s Rise ime<10μs 8 8 4

5 Wha o Look for in a SOP Emulaor? 1) Emulae real fiber Quasi-uniform rae scrambling (Tornado mode) 2) Speed 3) Efficiency 9 9 Wha o Look for in a SOP Emulaor? 1) Emulae real fiber 2) Speed 3) Efficiency 4) Transien effecs Tracking circui/algorihm recovery from disrupive SOP change Disrupive SOP change Recovery ime 10 5

6 Wha o Look for in a SOP Emulaor? 1) Emulae real fiber 2) Speed 3) Efficiency 4) Transien effecs 5) Inserion Loss 11 SOP relaed esing Polarizaion Orhogonaliy TX RX TX processor PBC PBS 90 hybrid DSP 12 6

7 SOP relaed esing Polarizaion Orhogonaliy TX RX TX processor DARK PBC PBS 90 hybrid DSP 13 SOP relaed esing Polarizaion Orhogonaliy TX processor DARK TX PBC RX PBS 90 hybrid DSP 14 7

8 SOP Relaed Tesing Long Term Monioring SOP Transien SOP change ime 15 SOP Relaed Tesing Long Term Monioring SOP Transien SOP change ime Capure rae (samples/s) Threshold sampling 2,000, SOP 16 8

9 Basics of Polarizaion Mode Dispersion DGD (1 s order PMD) PMD emulaor PMD vecor: PSP (slow axis) SOP( ) PSP (fas axis) 17 Basics of Polarizaion Mode Dispersion DGD (1 s order PMD) PMD emulaor PMD vecor: PSP (slow axis) SOP( ) PSP (fas axis) 18 9

10 DGD (ps) Basics of Polarizaion Mode Dispersion DGD (1 s order PMD) PMD emulaor PMD vecor: PSP (slow axis) SOP( ) PSP (fas axis) 19 Basics of Polarizaion Mode Dispersion DGD (1 s order PMD) PMD emulaor S 3 S 3 <PMD> S 1 S2 S 1 S2 PMD vecors: ( ) Opical frequency = PSP: ˆ ( ) ( DGD: ) 20 10

11 PMD Emulaor for PMD Relaed Tes PMD PMD Tracking Speed Tes PMD 1 s order PMD generaion 2 nd order PMD generaion PMD Recovery Time Tes PMD Tolerance Range Tes TX RX SOP emulaor PMD emulaor PDL emulaor PC BER Teser 21 Wha o Look for in a PMD Emulaor 1) Emulae real fiber Maxwellian probabiliy disribuion 5000 poins Generaed by GP s PMDPro 22 11

12 Wha o Look for in a PMD Emulaor 1) Emulae real fiber 2) Speed Birefringen Crysals Roaor #1 Roaor #2 Roaor #N PMD E PMD Abrup PMD changes generaed by PMDPro a 1ms PMD generaion speed PMD T PMD D PMD C BER Before FEC Recovery Time PMD A PMD B hinge model H. Kogelnik, e.al. IEEE P (2005) 23 Wha o Look for in a PMD Emulaor 1) Emulae real fiber 2) Speed Birefringen Crysals Roaor #1 Roaor #2 Roaor #N PMD Abrup PMD changes generaed by PMDPro a 1ms PMD generaion speed PMD T PMD E PMD D PMD C BER Before FEC Recovery Time PMD A PMD B hinge model H. Kogelnik, e.al. IEEE P (2005) 24 12

13 SOPMD (ps 2 ) Wha o Look for in a PMD Emulaor 1) Emulae real fiber 2) Speed 3) Efficiency Deerminisic conrol Fas uning speed Recall sored PMD seings 25 Wha o Look for in a PMD Emulaor 1) Emulae real fiber 2) Speed Coverage of GP s PMDPro 3) Efficiency 4) Range DGD (ps) 26 13

14 power Wha o Look for in a PMD Emulaor 1) Emulae real fiber 2) Transien effecs 3) Efficiency 4) Range SOPMD (ps2) Generaed 90ps by PMDPro GP s PMDPro DGD (ps) 27 Mehods of PMD Measuremen Fixed Analyzer Mehod Jones Marix Eigen Analysis Mehod Inerferomeric Mehod IEC : Measuremen Mehods and Tes Procedures 28 14

15 Comparison of PMD Measuremen Mehods Fixed Analyzer JME / Mueller Marix Inerferomeric Simpliciy/Cos DGD vs λ Dynamic range Speed Inpu SOP Sens. SOPMD PSP Lab/Research Field Use 29 PMD Measuremen for Componen Characerizaion PolaWise PC S SOP Generaor DUT SOP Analyzer 30 15

16 In-Service Link PMD Measuremen WDM MUX Fiber link WDM DeMUX ASE RX Polarizer Tunable filer Polarizaion Swich Tunable channelized ASE source PMDPro DOP afer PMDC (%) DGD (ps) 31 In-Service Link PMD Measuremen WDM MUX Fiber link WDM DeMUX ASE RX Polarizer Tunable filer Polarizaion Swich Tunable channelized ASE source PMDPro TX TX processor TX processor DARK same daa sequence PBC TX PBC DOP afer PMDC (%) DGD (ps) 32 16

17 PDL Power Power Polarizaion Dependen Loss Inpu Device Under Tes (DUT) Examples of PDL sources: Angled inerfaces Fiber bending Polarizaion dependen gain Componens: Componen PC connecor APC connecor 3dB fused coupler Isolaor circulaor DWDM Polarizer Oupu Pmax Pmin PDL=10log(Pmax/Pmin) ime Typical PDL value ~ 0.02 db 0.02 ~ 0.06 db 0.1 ~ 0.3 db 0.05 ~ 0.3 db 0.1 ~ 0.2 db 0.05 ~ 0.15 db 30 ~ 50 db 33 PDL Measuremen Mehods Advanced SOP scanning (min-max search) PDL-meer λ 1 λ 2 λ 3 Inernal polarizaion conroller Inernal phoodeecor Pmax Trigger Pmin S Mueller Marix Mehod DUT ime PolaWise PC S SOP Generaor DUT SOP Analyzer wavelengh 34 17

18 PDL Relaed Tess PDL Tracking Speed Tes PDL PDL Recovery Time Tes PDL PDL Tolerance Range Tes PDL generaion TX RX SOP emulaor PMD emulaor PDL emulaor PC BER Teser 35 PDL Tracking Speed Tess Generaed by PDL Emulaor Triangle wave PDL variaion Large range: 0.1 ~ 20 db High Resoluion: 0.1 db Measured by PDL Meer 36 18

19 PDL Recovery Time Tess Generaed by PDL Emulaor Square wave PDL variaion ~1ms response ime Measured by PDL Meer 37 Summary of Polarizaion Relaed Tesing SOP/PMD/PDL Analyzer (PolaWise ) Hi Speed Polarimeer TX processor T X PBC SOP Emulaor PMD Emulaor PDL Emulaor R X PBS 90 hybrid DSP DeMUX algorihm PMDC algorihm PDLC algorihm Polarizaion Demux PMDC PDLC SOP Tracking Speed PMD Tracking Speed PDL Tracking Speed SOP Recovery Time PMD Recovery Time PDL Recovery Time SOP Orhogonaliy PMD Tolerance Range PDL Tolerance Range 38 19

20 Thank You!