Rapid programmable/code-length-variable, time-domain bit-by-bit code shifting for high-speed secure optical...

Area of Science:

• Optoelectronics
• Information Security
• Optical Communications

Background:

• Current optical communication systems face security vulnerabilities, including code extraction through spectral analysis and susceptibility to conventional demodulation attacks.
• The need for robust security measures in high-speed data transmission is paramount to prevent unauthorized access and data breaches.

Purpose of the Study:

• To propose and demonstrate a time-domain bit-by-bit code-shifting scheme for advanced information security in optical communications.
• To enhance the security of ultralong, variable-length optical codes against sophisticated eavesdropping techniques.

Main Methods:

• Implementation of a time-domain bit-by-bit code-shifting scheme utilizing a dispersive element and a high-speed phase modulator.
• Operation within the bit overlap regime to prevent code extraction via spectral phase analysis.
• Testing the scheme's immunity to conventional power detection and differential-phase-shift-keying (DPSK) demodulation attacks.

Main Results:

• Successful demonstration of a novel optical coding scheme for secure data transmission.
• Transmission of 10 Gbits/s return-to-zero-DPSK data over 49 km error-free, secured by bit-by-bit code shifting with up to 1024 chip optical code patterns.
• Elimination of vulnerabilities associated with spectral analysis and conventional demodulation attacks.

Conclusions:

• The proposed bit-by-bit code-shifting scheme significantly enhances information security in optical communications.
• The scheme offers a robust solution for high-data-rate secure optical communication, with potential applications in realizing one-time pad encryption.
• This advancement paves the way for more secure and resilient future optical networks.