All-optical format conversion from CS-RZ to NRZ at 40Gbit/s

Area of Science:

• Optical communications
• Photonics
• Signal processing

Background:

• Carrier-suppressed return-to-zero (CS-RZ) is a spectrally efficient optical data format.
• Efficient all-optical format conversion is crucial for high-speed optical networks.
• Non-return-to-zero (NRZ) is a widely used and robust optical data format.

Purpose of the Study:

• To propose and demonstrate a 40Gbit/s all-optical format conversion technique.
• To convert CS-RZ signals to NRZ signals.
• To achieve simultaneous dual-wavelength NRZ output.

Main Methods:

• Utilized a temperature-controlled all-fiber delay interferometer (DI).
• Employed narrow-band filters for signal selection.
• Performed theoretical analysis using numerical simulation and spectral analysis.

Main Results:

• Successfully demonstrated 40Gbit/s CS-RZ to NRZ all-optical format conversion.
• Achieved simultaneous NRZ signal generation at two different wavelengths.
• Demonstrated independence from polarization and input power variations.
• Obtained a power penalty of 1.6dB and an output extinction ratio of 15dB.

Conclusions:

• The proposed method offers an effective solution for CS-RZ to NRZ format conversion.
• The all-fiber DI approach provides a stable and reliable platform for optical signal processing.
• The technique is suitable for high-speed optical communication systems requiring format flexibility.