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OCDMA Optical Source Development April 16, 2005

OCDMA Optical Source Development April 16, 2005. Jason Chou, Ozdal Boyraz, and Bahram Jalali University of California, Los Angeles. Goal. Conventional supercontinuum source produces broadband spectrum, where only small portion is used Goal is to create spectrum only where it is needed

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OCDMA Optical Source Development April 16, 2005

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  1. OCDMA Optical Source DevelopmentApril 16, 2005 Jason Chou, Ozdal Boyraz, and Bahram Jalali University of California, Los Angeles

  2. Goal • Conventional supercontinuum source produces broadband spectrum, where only small portion is used • Goal is to create spectrum only where it is needed • Approaches: • Broadband comb generations • Asymmetric comb generation

  3. SC-enhanced Mode Locked Source Filter MLL DS Fiber EDFA • Requires only a few longitudinal modes from the mode locked laser • Simplifies design • Extend the spectrum to create a broad comb of frequencies of multi-THz bandwidth by super-broadening • Decouples the laser design from the spectrum requirement of OCDMA

  4. Broadband Spectral Comb Generation ML Laser Line Selection Filter DS Fiber EDFA p p p • Desired lines are selected from MLL spectrum • Act as seed for generating desired spectral lines • Generation achieved using SPM and FWM in nonlinear media

  5. Asymmetric Broadband Spectral Comb Generation DSF1 DSF3 DSF2 Seed Pulse AWG EDFA DS Fibers p p p • Spectrum location is optimized using dispersion slope engineering

  6. Numerical Simulation After FWM in single mode fiber Starting Spectrum Asymmetry Optical Frequency Optical Frequency • Asymmetry in spectrum can be induced through dispersion slope • Effect is modest in standard single mode fiber • Can be drastic in dispersion engineered media

  7. Conventional Supercontinuum Generation Experimental Demonstration Output Spectrum Input Seed • Independent control of channel separation and total bandwidth • Power is concentrated in discrete OCDMA channels • >25nm bandwidth • Promising approach

  8. Next Steps • Dispersion engineering will be investigated by cascading fibers with dispersion tailored profiles to improve efficiency and flatten channel profile. • Dynamic range per channel is limited by ASE-FWM beating effect which can be mitigated by adding narrowband optical filters to suppress EDFA noise background. • Alternative approach to improve FWM efficiency and reduce noise is to filter and overlap MLL pulses before passing through dispersion engineered fibers.

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