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학술지 A Low-Crosstalk Design of 1.25 Gbps Optical Triplexer Module for FTTH Systems
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김성일, 박선택, 문종태, 이해영
ETRI Journal, v.28 no.1, pp.9-16
한국전자통신연구원 (ETRI)
04MB2600, 광엑세스용 광집적 모듈, 오광룡
In this paper, we analyzed and measured the electrical crosstalk characteristics of a 1.25 Gbps triplexer module for Ethernet passive optical networks to realize fiber-to-the-home services. Electrical crosstalk characteristic of the 1.25 Gbps optical triplexer module on a resistive silicon substrate should be more serious than on a dielectric substrate. Consequently, using the finite element method, we analyze the electrical crosstalk phenomena and propose a silicon substrate structure with a dummy ground line that is the simplest low-crosstalk layout configuration in the 1.25 Gbps optical triplexer module. The triplexer module consists of a laser diode as a transmitter, a digital photodetector as a digital data receiver, and an analog photodetector as a cable television signal receiver. According to IEEE 802.3ah and ITU-T G.983.3, the digital receiver and analog receiver sensitivities have to meet -24 dBm at BER=10-12 and -7.7 dBm at 44 dB SNR. The electrical crosstalk levels have to maintain less than -86 dB from DC to 3 GHz. From analysis and measurement results, the proposed silicon substrate structure that contains the dummy line with 100 μm space from the signal lines and 4 mm separations among the devices satisfies the electrical crosstalk level compared to a simple structure. This proposed structure can be easily implemented with design convenience and greatly reduce the silicon substrate size by about 50%.
KSP 제안 키워드
25 Gbps, Analysis and measurement, Cable television(CATV), Dielectric substrate, Digital data, Ethernet Passive Optical Network, Finite Element Method(FEM), IEEE 802, ITU-T, Laser diode(LD), Signal Receiver