Physical random bit generation from chaotic solitary laser diode.

Area of Science:

• Optoelectronics
• Nonlinear Dynamics
• Information Security

Background:

• Optical chaos has potential for random number generation.
• Previous methods required complex setups like external feedback.
• Low-dimensional chaos was thought to limit generation speed.

Purpose of the Study:

• To demonstrate high-speed random bit generation from a solitary laser diode.
• To overcome limitations of low-dimensional chaos in optical applications.
• To explore the role of polarization dynamics in chaos generation.

Main Methods:

• Utilized a solitary laser diode without external optical feedback or injection.
• Analyzed the chaotic polarization dynamics of the laser.
• Measured the dynamical entropy growth rate.

Main Results:

• Achieved physical generation of random bits at bit rates exceeding 100 Gb/s.
• Demonstrated high-speed randomness despite low-dimensional and limited-bandwidth chaos.
• Linked successful high-speed randomness to chaotic polarization dynamics and entropy growth.

Conclusions:

• Solitary laser diodes can generate high-speed random bits.
• Polarization dynamics in lasers are key to high-performance chaos applications.
• This simplifies random bit generation for secure communication systems.