Noise-assisted binary information transmission in vertical cavity surface emitting lasers

Area of Science:

• Optics and Photonics
• Optical Communications
• Nonlinear Dynamics

Background:

• Vertical cavity surface emitting lasers (VCSELs) are crucial for optical communication systems.
• Polarization bistability in VCSELs offers potential for advanced modulation schemes.
• Understanding noise effects is vital for optimizing laser-based data transmission.

Purpose of the Study:

• To experimentally investigate the impact of additive noise on the performance of a polarization-bistable VCSEL.
• To evaluate the transmission quality of a pseudorandom binary signal modulated VCSEL system.
• To explore the potential of noise-enhanced transmission in optical communication.

Main Methods:

• Experimental setup utilizing a polarization-bistable VCSEL.
• Modulation with a small amplitude, pseudorandom binary signal.
• Systematic addition of controlled noise to the optical signal.
• Measurement of output contrast and bit-error rate (BER).

Main Results:

• A high-contrast output was achieved with the addition of optimum noise levels.
• The bit-error rate demonstrated a resonant-like dependence on the input noise intensity.
• The noise-enhanced transmission scheme showed distinct performance characteristics compared to standard amplitude modulation.

Conclusions:

• Optimal noise addition can significantly enhance the transmission performance of polarization-bistable VCSELs.
• The observed resonant behavior suggests a specific operating regime for improved data integrity.
• This technique presents a novel approach for optical communication, warranting further investigation and comparison with existing modulation schemes.