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Demetri Psaltis, Caltech

Holographic Wavelength Filters. Demetri Psaltis, Caltech. OUTLINE. Holographic filters Tunable filters Tunable WDM architectures. Recording. Read-out. =/2. Piezoelectric mirror. Stabilized Recording. Detector. Detector. Control. Holographic Add-Drop Filter. in. add. drop.

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Demetri Psaltis, Caltech

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  1. Holographic Wavelength Filters Demetri Psaltis, Caltech OUTLINE • Holographic filters • Tunable filters • Tunable WDM architectures

  2. Recording

  3. Read-out =/2

  4. Piezoelectric mirror Stabilized Recording Detector Detector Control

  5. Holographic Add-Drop Filter in add drop thru

  6. Fiber coupling D Grin lens Ferule INPUT FIBER To express collimator DROP FIBER PASSBAND SHAPING BY COUPLING ADJUSTMENT

  7. Cross-talk Grin lens Ferule INPUT FIBER EXPRESS FIBER DROP FIBER 20 dB extra extinction by fiber coupling. No “cladding” Modes.

  8. Polarization dependent loss In-band PDL (± 10 GHz): < 0.2 dB Polarization dependant shift: 1.2 GHz

  9. Side-lobe suppression 1st pass 2nd pass Double passing through grating

  10. Side-lobe suppression without apodization with apodization

  11. Chromatic dispersion

  12. Emitter frequency drift: power penalty 4 Rx threshold kept constant, optimised at 193.699THz 3 "Cross" input light polarisation 2 "Bar" input light penalty (dB) polarisation 1 ~16GHz Bandwidth available 0 Channel 17 PRBS=215-1 32 WDM channels -1 193,68 193,69 193,7 193,71 193,72 Frequency (THz) Courtesy of Alcatel

  13. Tunable Add-drop filter: block diagram origin destination l2 ADD fiber l1 l1 l2 l2 IN EXPRESS l3 l3 l2 DROP

  14. Tunable Add-drop filter: block diagram origin destination l3 ADD fiber l1 l1 l2 l2 IN EXPRESS l3 l3 l3 DROP

  15. EXPRESS INPUT ADD DROP Dual fiber collimator Dual fiber collimator

  16. Tunable filter

  17. Tunable filter

  18. Tunable filter

  19. Tunable filter

  20. RECONFIGURABLE WAVELENGTH ROUTING Tunable add-drop filters (hitless)

  21. Hitless tuning

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