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Channel Enlargement of PON System Using Nonreciprocal Multiplexing Filter Based on CWDM
Bong Kyu Kim, Bin Young Yoon, and Yool Kwon
Abstract :	We propose a nonreciprocal filter based on coarse wavelength division multiplexing (CWDM) that reduces the upstream channel insertion loss in a passive optical network (PON). We also propose a method to increase the number of channels/optical network units (ONUs) in PON systems using the proposed filter to reduce the service cost per subscriber. Experimental results show that the PON system with the proposed 4-channel filter can reduce the power budget of the upstream and increase the number of ONUs by 3 to 4 times that of a conventional time-division multiplexing PON.
Key word :	Fiber optics communications, optical access network, passive optical network (PON).
DOI :	http://dx.doi.org/10.4218/etrij.09.0208.0346
Cite this :	Bong Kyu Kim, Bin Young Yoon, and Yool Kwon, "Channel Enlargement of PON System Using Nonreciprocal Multiplexing Filter Based on CWDM," ETRI Journal, vol. 31, no. 2, Apr. 2009, pp. 231-233. http://dx.doi.org/10.4218/etrij.09.0208.0346
References :	1. J.R. Stern et al., "Passive Optical Local Networks for Telephony Applications and Beyond," Electronics Lett., vol. 23, no. 24, 1988, pp. 1255-1257. 2. D. Shea et al., "10 Gbit/s PON with 100 km Reach and x1024 Split," Proc. of ECOC, 2003, pp. 850-851. 3. PIEMAN Project website, http://www.ist-pieman.org. 4. N. Calabretta et al., "A Bidirectional WDM/TDM-PON Using DPSK Downstream Signals and a Narrowband AWG," IEEE Photonics Tech. Lett., vol. 19, no. 16, 2007, pp. 1227-1229. 5. H.-H. Lu et al., "Bidirectional Hybrid DWDM-PON for HDTV/Gigabit Ethernet/CATV Applications," ETRI J., vol. 29, no. 2, 2007, pp. 162-168.
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