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Optical filtering in directly modulated/detected OOFDM systems.

C Sánchez, B Ortega, J L Wei

    Optics Express
    |February 12, 2014
    PubMed
    Summary
    This summary is machine-generated.

    This study optimizes optical filters for directly modulated/detected optical orthogonal frequency division multiplexed (DM/DD-OOFDM) systems. Optical filtering significantly improves power budget by up to 5.5dB, depending on the clipping ratio.

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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Photonics

    Background:

    • Directly modulated/detected (DM/DD) optical orthogonal frequency division multiplexing (OOFDM) systems are susceptible to performance degradation from optical filtering.
    • Linear and nonlinear distortion effects in these systems require careful consideration for accurate performance evaluation.

    Purpose of the Study:

    • To theoretically investigate the performance of DM/DD-OOFDM systems under optical filtering.
    • To optimize the design of optical filtering structures for improved system performance.
    • To quantify the power budget improvement achievable through optimized optical filtering.

    Main Methods:

    • Theoretical analysis of DM/DD-OOFDM system performance.
    • Calculation of effective signal-to-noise ratio (SNR) per subcarrier, accounting for linear and nonlinear distortions.
    • Optimization of Mach Zehnder interferometer and uniform fiber Bragg grating filter parameters.

    Main Results:

    • Significant optical power budget improvements of 3.3dB (Mach Zehnder) and 3dB (fiber Bragg grating) were achieved.
    • Further improvements to 5.5dB and 4.2dB were realized using balanced detection configurations.
    • The performance enhancement is highly dependent on the clipping ratio, indicating its critical role in system design.

    Conclusions:

    • Optimized optical filtering structures offer substantial power budget improvements in DM/DD-OOFDM systems.
    • Balanced detection further enhances the benefits of optical filtering.
    • System design must consider the clipping ratio for maximizing the effectiveness of optical filtering strategies.