研究目的
To experimentally evaluate the performance of an NG-PON2 network by analyzing the impact of different inter-channel spacing variations on data transmission using BER and OPP measurements.
研究成果
The experimental results demonstrate that larger inter-channel spacing (0.4 nm) yields better network performance with lower BER and OPP compared to smaller spacing (0.2 nm), which incurs a 3 dB penalty. This is attributed to increased effects of chromatic dispersion and nonlinearities at smaller spacings. The findings highlight the importance of channel spacing selection in NG-PON2 design to optimize performance and maintain compatibility with existing standards.
研究不足
The study focused only on downstream transmission and used a specific PtP-WDM ODN type; it did not address upstream transmission or other ODN architectures. The experimental setup was laboratory-based, potentially limiting real-world applicability, and only two inter-channel spacings were tested, which may not cover all possible variations.
1：Experimental Design and Method Selection:
The experiment was designed to test NG-PON2 network performance with two inter-channel spacings (0.2 nm and 0.4 nm) using BER and OPP measurements. It involved simulating downstream transmission in a PtP-WDM ODN type as per ITU-T G.989 standards.
2：2 nm and 4 nm) using BER and OPP measurements. It involved simulating downstream transmission in a PtP-WDM ODN type as per ITU-T G.989 standards.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The study used a laboratory setup with optical components and fibers; no external datasets were mentioned.
3：List of Experimental Equipment and Materials:
Equipment included Continuous-Wave Lasers (CWLs), Mach-Zehnder intensity modulators (MZ-IMs), a 4:1 wavelength multiplexer (WM), G.652D optical fiber (20-29 km length), Variable Optic Attenuator (VOA), tunable optical filter (TOF), PIN photoreceiver, and Bit Error Rate Tester (BERT). Materials involved optical signals at specific wavelengths in the L band (1603-1625 nm).
4：Experimental Procedures and Operational Workflow:
The setup involved generating four 10 Gb/s optical signals with specified wavelengths, multiplexing them, transmitting over optical fiber with varying lengths and attenuations, filtering at the receiver, converting to electrical signals, and measuring BER and OPP. Tests were conducted for both 0.2 nm and 0.4 nm spacings, with measurements taken at different received optical powers and link lengths.
5：2 nm and 4 nm spacings, with measurements taken at different received optical powers and link lengths.
Data Analysis Methods:
5. Data Analysis Methods: Data were analyzed by plotting BER vs. received optical power curves and OPP vs. link length curves to compare performance penalties between different spacings.
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