| Summary: | 碩士 === 國立臺灣科技大學 === 光電工程研究所 === 107 === We investigated here the feasibility and limitation of a Hybrid-PON system for transmitting 25-Gb/s and above data rates. The hybrid system structure includes three different modes of operation: Time Division Multiplexing (TDM), Wavelength Division Multiplexing (WDM), and Time and Wavelength Division Multiplexing (TWDM) Passive Optical Networks (PONs). The main advantage of this architecture is that the user terminal side can be easy graded, adjusted and allocated, according to the user requirements. The number of users and the required power for transmission over 20 km single-mode fiber (SMF) at different operation modes has been discussed. If the optical amplifiers is used to compensate the loss, the TDM/TWDM mode can be realized to transmit 25 Gb/s NRZ, while the WDM mode can transmit 50 Gb/s NRZ, and according to the current system specifications, TWDM and TDM can support 1024 users whereas the WDM can provide 15 high speed users.
In order to verify the high-data-rate transmission, the quality of optical transmitters is especially important. In this work, we measured two the performance of Linear Quad EML Driver and an 8-channel QSFP-DD, transceiver which are based on the 400GBASE-LR8 standard for transmitting 28-Gbaud/s PAM-4 signals. The bit error rate is 1.11x10-9 for back-to-back (B2B) transmission, and the TDECQ value is as low as 1.26. With the equalization and compensation effect at the receiver, the bit error rate can be improved to 2.47x10-10. After transmitting through 20 km long SMF with receiver compensation, the bit error rate can reach 8.49×10-6. All of the above results can meet the bit error rate requirement of receivers with forward error correcting (FEC). With the high-speed and long-distance transmission characteristics, the receivers are feasible for applications in the hybrid PONs to improve overall transmission quality.
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