Small and Low-Cost Dual-Rate Optical Triplexer for OLT Transceivers in 10G/1G Co-existing 10G-EPON Systems

Atsushi KANDA
Akira OHKI
Takeshi KUROSAKI
Hiroaki SANJOH
Kota ASAKA
Ryoko YOSHIMURA
Toshio ITO
Makoto NAKAMURA
Masafumi NOGAWA
Yusuke OHTOMO
Mikio YONEYAMA

Publication
IEICE TRANSACTIONS on Electronics   Vol.E96-C    No.7    pp.996-1002
Publication Date: 2013/07/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E96.C.996
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Advances in Integrated Photonic Devices)
Category: 
Keyword: 
10G-EPON,  triplexer,  light collection system,  miniaturization,  cost reduction,  

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Summary: 
The 10-gigabit Ethernet passive optical network (10G-EPON) is a promising candidate for the next generation of fiber-to-the-home access systems. In the symmetric 10G-EPON system, the gigabit Ethernet passive optical network (GE-PON) and 10G-EPON will have to co-exist on the same optical network. For this purpose, an optical triplexer (10G-transmitter, 1G-transmitter, and 10G/1G-receiver) for optical line terminal (OLT) transceivers in 10G/1G co-existing EPON systems has been developed. Reducing the size and cost of the optical triplexer has been one of the largest issues in the effort to deploy 10G-EPON systems for practical use. In this paper, we describe a novel small and low-cost dual-rate optical triplexer for use in 10G-EPON applications. By reducing the optical path length by means of a light collection system with a low-magnification long-focus coupling lens, we have successfully miniaturized the optical triplexer for use in 10G-EPON OLT 10-gigabit small form factor pluggable (XFP) transceivers and decreased the number of lenses. A low-cost design of sub-assemblies also contributes to cost reduction. The triplexer's performance complies with IEEE 802.3av specifications.