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PDM RZ-to-NRZ and NRZ-to-PRZ format conversions using a variable DGD element inside a polarization-diversified loop
1Center for Information Photonics & Communications, School of Information Science & Technology, Southwest Jiaotong University, Chengdu, Sichuan 610031, China.
A new method enables flexible bit-rate conversion for polarization-division-multiplexed signals. This technique efficiently changes signal formats with minimal power loss, advancing optical communication systems.
Area of Science:
- Optical Communications
- Signal Processing
Background:
- Polarization-Division-Multiplexing (PDM) is crucial for high-capacity optical networks.
- Efficient format conversion is needed for flexible data transmission.
Purpose of the Study:
- To propose a novel scheme for bit-rate-variable format conversion in PDM systems.
- To demonstrate the conversion from return-to-zero (RZ) to non-return-to-zero (NRZ) and NRZ to pseudo-return-to-zero (PRZ).
Main Methods:
- Utilizing a variable differential-group-delay (DGD) element within a polarization-diversified loop.
- Implementing the scheme for 2x10 Gbit/s and 2x12.5 Gbit/s PDM signals.
Main Results:
- Successful demonstration of bit-rate-variable format conversions.
- Achieved conversions with an approximate 1 dB additional power penalty.
- The power penalty was minimized by adjusting the DGD values of the variable element.
Conclusions:
- The proposed scheme offers an effective solution for flexible PDM signal format conversion.
- The method is compatible with high bit-rate optical communication systems.
- Minimal power penalty ensures practical applicability.
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