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Evaluation of an OPM Prototype: Optimal Optical Performance Monitoring Techniques

Conducting an evaluation of an Optical Performance Monitoring (OPM) prototype to assess different design options for free-space based OPM and delve into the potentialities/limits of optical performance monitoring techniques for transparent networks. The study includes the optical design, characterization results, and future perspectives for improving the prototype. The main focus is on monitoring 10 Gbit/s or 50/100 GHz spaced channels in metro or ULH systems, emphasizing parameters like channel power, channel wavelength, and OSNR measurement. The prototype achieves reconstruction of 50 GHz spaced channels with varying power levels, power dynamics, and OSNR measurement for isolated channels.

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Evaluation of an OPM Prototype: Optimal Optical Performance Monitoring Techniques

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  1. Evaluation of an OPM prototypeP. Gravey, GET-ENST BretagneT. Loukina, PERDYN platformAcknowledgements: ENIB/RESO, Optogone, France Télécom

  2. Outline • Context • Optical design • Characterization results • Perspectives

  3. Motivations • Evaluation of several design options for free-space based OPM • Understanding of the potentialities/limits of optical performance monitoring techniques for transparent networks

  4. Main requirements • Context • 10 Gbit/s / 50 GHz or 100 GHz spaced channels • metro or ULH systems based on ROADMs • Parameters to be monitored • Channel power • Channel wavelength ? • OSNR (measured or calculated ?)

  5. Fibre & L1 lens InGaAs array Grating L2 lens Optical design • 900 mm-1 grating • 512 pixels InGaAs array (25 µm pitch) • ×5 mode size magnification • ~ 360 pixels for the C band

  6. OPM characterization (2 channels)

  7. Gaussian profile reconstruction Detected signal Reconstructed shape 5 channels with same power 5 channels with 5dB power difference

  8. Alarm generation • Number of channels • Power level • Wavelength drift • (Apparent) spectral width

  9. Main results • Reconstruction of 50 GHz spaced channels (10 Gbit/s NRZ modulation) with 5 dB power difference • Power dynamics ~ 20 dB (limited by camera electronics) • OSNR measurement for isolate channels (~ 125 GHz separation)

  10. Future work • Improvement of optical resolution • Revised design with more pixels/channel • Improvement of profile reconstruction • Influence of neighbouring channels • 40 Gbit/s modulation formats • Results should be available for inclusion in D.JP-T.3 • Prototype available for partners from Q4 2007

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