16-level differential phase shift keying (D16PSK) in direct detection optical communication systems

Area of Science:

• Optoelectronics and Optical Communications
• Digital Communication Systems

Background:

• Direct detection optical communication systems require advanced modulation formats for higher data rates.
• Differential phase shift keying (DPSK) is a robust modulation technique, with higher-order formats offering increased spectral efficiency.

Purpose of the Study:

• To propose and analyze a novel Optical 16-level differential phase shift keying (D16PSK) modulation scheme.
• To evaluate the performance of D16PSK in direct detection optical communication systems, considering key system impairments.

Main Methods:

• Schematic design of a transmitter and receiver for D16PSK.
• Numerical investigation of receiver sensitivity.
• Analysis of the impact of chromatic dispersion and nonlinear transmission degradations on D16PSK performance.

Main Results:

• The proposed D16PSK scheme enables the transmission of four bits per symbol, enhancing spectral efficiency.
• Receiver sensitivity was analyzed, providing insights into system performance limitations.
• The study quantifies the detrimental effects of chromatic dispersion and nonlinearities on the D16PSK signal.

Conclusions:

• Optical D16PSK is a viable modulation format for direct detection systems, offering high spectral efficiency.
• Understanding and mitigating chromatic dispersion and nonlinear effects are crucial for successful D16PSK deployment.