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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Simultaneous DPSK demodulation and chirp management using delay interferometer in symmetric 40-Gb/s capability
Meihua Bi1, Shilin Xiao, Hao He
1State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Optics Express
|August 14, 2013
Summary
This study presents a 40 Gb/s time and wavelength division multiplexed passive optical network (TWDM-PON) system. It enables simultaneous downstream demodulation and upstream chirp management, supporting 256 users over 50 km SMF.
Area of Science:
- Optical Communications
- Telecommunications Engineering
- Photonics
Background:
- Passive optical networks (PONs) are crucial for broadband access.
- Time and Wavelength Division Multiplexing (TWDM) enhances PON capacity.
- Managing upstream signal quality and downstream demodulation in TWDM-PONs presents challenges.
Purpose of the Study:
- To propose and experimentally validate a symmetric 40-Gb/s TWDM-PON system.
- To demonstrate simultaneous downstream differential phase shift keying (DPSK) demodulation.
- To achieve effective upstream signal chirp management and enhance power budget.
Main Methods:
- Utilizing a delay interferometer (DI) for its bi-pass characteristics.
- Implementing a symmetric TWDM-PON architecture.
- Experimentally transmitting bidirectional signals at 10-Gb/s per wavelength over 50-km single mode fiber (SMF).
Main Results:
- Negligible power penalties were observed after 50-km SMF transmission.
- An ~11-dB optical power budget improvement and enhanced extinction ratio (ER) from 3.4 dB to 13.75 dB for upstream transmission.
- Successful demonstration of upstream burst-mode transmission due to high ER.
- Achieved a ~38-dB power budget supporting 256 users over 50-km SMF.
Conclusions:
- The proposed DI-based TWDM-PON system effectively supports high-speed bidirectional communication.
- The system demonstrates significant improvements in optical power budget and signal quality for upstream transmission.
- The architecture is scalable and suitable for supporting a large number of users over extended distances.
