Title :
DC-Balanced Line Coding for Downlink Modulation in Bidirectional WDM PONs Using Remodulation
Author :
Al-Qazwini, Zaineb ; Kim, Hoon
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore, Singapore
Abstract :
We experimentally investigate the use of DC-balanced line coding in a wavelength-shared bidirectional wavelength-division-multiplexed passive optical network using 10-Gb/s directly modulated lasers (DMLs) for downlink and 2.5-Gb/s reflective semiconductor optical amplifiers for uplink. We show that the line coding not only allows us to utilize the flat frequency response of the DML but it also alleviates the downlink-to-uplink crosstalk induced by remodulation.
Keywords :
crosstalk; frequency response; modulation; network coding; passive optical networks; semiconductor optical amplifiers; wavelength division multiplexing; DC-balanced line coding; DML; bidirectional WDM PON; directly modulated lasers; downlink modulation; downlink-to-uplink crosstalk; flat frequency response; line coding; passive optical network; reflective semiconductor optical amplifier; remodulation; wavelength-shared bidirectional wavelength division multiplexing; Bit error rate; Downlink; Encoding; Frequency shift keying; Optical network units; Wavelength division multiplexing; Direct modulation; line coding; passive optical network; wavelength-division multiplexing (WDM);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2160530
