Multifunctional switching unit for add/drop, wavelength conversion, format conversion, and WDM multicast based on...

Area of Science:

• Photonics and Optical Communications
• Integrated Optics
• Semiconductor Devices

Background:

• Advanced optical switching units are crucial for high-capacity fiber optic networks.
• Liquid Crystal on Silicon (LCoS) and Semiconductor Optical Amplifiers (SOA) offer unique properties for optical signal processing.
• Bidirectional functionality in optical components enables more flexible network architectures.

Purpose of the Study:

• To propose and experimentally demonstrate a multifunctional optical switching unit.
• To leverage the bidirectional nature of LCoS and the gain properties of SOA for enhanced optical signal processing.
• To showcase key functionalities including add/drop, wavelength conversion, format conversion, and WDM multicast.

Main Methods:

• Utilizing a hybrid architecture combining a bidirectional Liquid Crystal on Silicon (LCoS) device with a Semiconductor Optical Amplifier (SOA).
• Employing four-wave mixing (FWM) in the SOA for wavelength and format conversion.
• Implementing WDM (Wavelength Division Multiplexing) multicast using the proposed architecture.

Main Results:

• Experimental demonstration of add/drop, wavelength conversion, and format conversion functionalities.
• Successful dual-channel wavelength and format conversion from 2 × 25Gbps DQPSK to 2 × 12.5Gbps DPSK using a single pump.
• Achieved one-to-six WDM multicast of 25Gbps DQPSK signals with minimal power penalty (<1.1 dB) at the FEC threshold.

Conclusions:

• The proposed LCoS-SOA based optical switching unit offers a versatile platform for multiple optical signal processing functions.
• The bidirectional LCoS device effectively manages signal multiplexing and de-multiplexing.
• The architecture enables efficient wavelength/format conversion and WDM multicast with high performance, paving the way for advanced optical networks.