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Radio-over-fiber DSB-to-SSB conversion using semiconductor lasers at stable locking dynamics
Optics Express
|May 4, 2016
Summary
This study introduces a novel semiconductor laser method for converting double-sideband (DSB) to single-sideband (SSB) optical signals, crucial for radio-over-fiber systems. The technique offers stable, adaptable conversion up to 60 GHz without extra signals.
Area of Science:
- Photonics and Optical Communications
- Semiconductor Laser Dynamics
- Radio-over-Fiber (RoF) Systems
Background:
- Optical single-sideband (SSB) modulation is preferred in radio-over-fiber (RoF) systems to prevent microwave power fading.
- Existing modulation schemes often produce double-sideband (DSB) signals, necessitating a DSB-to-SSB conversion step.
- Effective and stable DSB-to-SSB conversion is critical for advanced RoF applications.
Purpose of the Study:
- To investigate a semiconductor laser's stable locking dynamics for efficient DSB-to-SSB optical signal conversion.
- To demonstrate a conversion method relying solely on nonlinear laser dynamics, eliminating the need for pump or probe signals.
- To assess the performance and adaptability of the proposed conversion technique across various operating conditions.
Main Methods:
- Utilizing the nonlinear dynamical interaction within a standard semiconductor laser to achieve DSB-to-SSB conversion.
- Employing a single semiconductor laser as the core conversion unit, driven by the input DSB signal.
- Testing the conversion performance across a wide tunable microwave frequency range (up to 60 GHz) and under signal fluctuations.
Main Results:
- Successful DSB-to-SSB conversion achieved using only a semiconductor laser, with a broad tunable frequency range up to 60 GHz.
- The conversion process demonstrated high adaptability and stability, tolerating fluctuations in microwave frequency, input power, and signal frequency.
- Preservation of microwave phase quality (linewidth, phase noise) and achievement of a bit-error ratio (BER) down to 10-9 at 8 Gb/s.
- A detection sensitivity improvement exceeding 1.5 dB was observed post-conversion.
Conclusions:
- A novel, robust, and cost-effective method for DSB-to-SSB optical signal conversion using a standard semiconductor laser has been developed.
- The proposed technique significantly enhances the feasibility of advanced radio-over-fiber systems by enabling efficient signal conditioning.
- The system's stability and performance metrics indicate its suitability for practical high-speed optical communication applications.
