Time domain add-drop multiplexing for RZ-DPSK OTDM signals

Area of Science:

• Optical communications
• Nonlinear optics
• Signal processing

Background:

• Optical time division multiplexing (OTDM) is a key technology for high-capacity optical networks.
• Efficient add-drop multiplexing is crucial for flexible network management and data routing.
• Existing methods often require optical-to-electrical-to-optical conversion, limiting speed and increasing complexity.

Purpose of the Study:

• To demonstrate all-optical time domain add-drop multiplexing for phase-modulated OTDM signals.
• To develop a novel add-drop multiplexer based on nonlinear optical effects.
• To achieve high-speed signal processing without optoelectronic conversion.

Main Methods:

• Construction of an add-drop multiplexer using a Kerr shutter.
• The Kerr shutter comprises a 375 m long highly nonlinear fiber (HNLF) with a nonlinear coefficient (gamma) of 20 W⁻¹km⁻¹.
• Utilizing nonlinear optical phenomena within the HNLF to control signal routing.

Main Results:

• Successful all-optical time domain add-drop multiplexing was achieved for the first time.
• Demonstrated multiplexing of 80 Gb/s RZ-DPSK OTDM signals.
• Operated with a 10 Gb/s base data rate, showcasing scalability.

Conclusions:

• The developed Kerr shutter enables efficient all-optical add-drop multiplexing.
• This technology offers a promising solution for future high-capacity, flexible optical networks.
• Eliminates the need for optoelectronic conversion, reducing latency and complexity.