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Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
Significant improvements in optical power budgets of real-time optical OFDM PON systems
J L Wei1, C Sánchez, R P Giddings
1School of Electronic Engineering, Bangor University, Dean street, Bangor, LL57 1UT, U. K.
Optics Express
|October 14, 2010
Summary
A novel optical filter enhances the extinction ratio of optical orthogonal frequency division multiplexing (OOFDM) signals, significantly improving the power budget in directly modulated laser systems without amplification or dispersion compensation.
Area of Science:
- Optical communications
- Photonics
- Signal processing
Background:
- Directly modulated laser (DML)-based intensity modulation and direct detection (IMDD) systems are crucial for cost-effective optical transmissions.
- Optical orthogonal frequency division multiplexing (OOFDM) offers high spectral efficiency but faces performance limitations in IMDD systems.
Purpose of the Study:
- To investigate the impact of physical factors on OOFDM system performance in IMDD SMF systems.
- To identify key limiting factors and propose a method to enhance system performance.
Main Methods:
- Development and verification of a theoretical OOFDM system model against experimental measurements at 11.25Gb/s.
- Analysis of extinction ratio (ER) and subcarrier intermixing effects.
- Simulation of an optical Gaussian bandpass filter's impact on system performance.
Main Results:
- Low extinction ratio (ER) of DML-modulated OOFDM signals is the primary limitation for optical power budget.
- Subcarrier intermixing reduces the optical power budget by at least 1dB.
- An optical Gaussian bandpass filter with specific offset improved ER by 1.24dB, yielding a 7dB power budget enhancement.
Conclusions:
- The extinction ratio of DML-modulated OOFDM signals is a critical parameter affecting system performance.
- An optical filter can effectively mitigate ER limitations and improve the power budget in IMDD OOFDM systems.
- The proposed filtering technique offers a practical solution for enhancing OOFDM system performance without complex hardware.
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