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Performance improvement of 10 Gb/s direct modulation OFDM by optical injection using monolithically integrated
C Browning1, K Shi, S Latkowski
1The Rince Institute, Dublin City University, Glasnevin, Dublin 9, Ireland. colm.browning2@mail.dcu.ie
Optics Express
|January 26, 2012
Summary
Optical injection using integrated Discrete Mode lasers significantly enhances 10 Gb/s OFDM system performance. This method reduces distortion, improving error correction rates below the forward error correction Bit Error Rate threshold.
Area of Science:
- Photonics and Optical Communications
- Integrated Optics
- Digital Signal Processing
Background:
- Directly modulated 10 Gb/s Orthogonal Frequency Division Multiplexing (OFDM) systems face performance limitations due to inter-modulation distortion.
- Monolithically integrated lasers offer potential for advanced optical modulation techniques.
Purpose of the Study:
- To experimentally demonstrate performance improvement in a 10 Gb/s OFDM system.
- To investigate the effect of optical injection using monolithically integrated Discrete Mode lasers.
- To quantify the reduction in third-order inter-modulation distortion and its impact on system performance.
Main Methods:
- Utilizing monolithically integrated Discrete Mode lasers for modulation and optical injection.
- Conducting experiments with varying fiber lengths.
- Measuring system performance against the forward error correction Bit Error Rate (BER) threshold.
Main Results:
- Optical injection successfully reduced third-order inter-modulation distortion by up to 10dB.
- System performance improved significantly, moving from above a BER threshold of 1 × 10(-3) to well below it.
- The effectiveness was demonstrated across different fiber lengths.
Conclusions:
- Monolithically integrated Discrete Mode lasers are effective for optical injection in directly modulated OFDM systems.
- Optical injection is a viable technique for mitigating distortion and enhancing system performance.
- This approach offers a pathway to achieving lower Bit Error Rates essential for reliable optical communication.
