| Summary: | 碩士 === 國立臺北科技大學 === 光電工程系研究所 === 98 === In this thesis, a bi-directional long-reach wavelength division multiplexing Passive Optical Network (WDM-PON), with 10 Gb/s bit rate in downlink and 5 Gb/s bit rate in uplink, are proposed. There are two channels with 0.4 nm channel spacing in downstream and upstream, respectively. The dispersion-compensating Raman amplifier /EDFA hybrid amplifier (DCRA/EDFA) which based on dispersion compensating fiber (DCF) is built in the local exchange. The DCRA/EDFA hybrid amplifier not only boost up the power budget, but also reduce the noise in long-reach transmission, including the chromatic dispersion and the effect of amplified spontaneous emission (ASE). Colorless operation is implemented by an electro-absorption modulator (EAM) to re-modulate the downstream signal in each reflective optical network units (R-ONUs) for uplink signals.
In this thesis, the hybrid DCRA/EDFA amplifier is verified to improve the fiber dispersion and reduce the loss through the long reach transmission. Due to this scheme, the fiber link can be extended to 120 km transmission and reduced the number of optical amplifiers. The comparison of different pumping type between the feed-forward and backward pumping in RZ-DPSK downlink signal and RZ-OOK uplink signal are presented. And the power penalty are less than 1dB in at 10-9 bit-error-rate in bi-directional fiber link . The results showed that the feed-forward pumping in hybrid amplifier integrated with colorless technique in long-reach WDM-PON transport system not only can reduce capital expenditures, but also can improve the signal performance. Furthermore, it will provide the better sensitivity in transmission.
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