Compact Optical Splitter Module for PON Architectu

by Shi Mingxun Fiber-Mart.com

Passive Optical Network (PON) system has expanded extensively as an optical network in the construction of Fiber To The Home (FTTH) economically.

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INTRODUCTION OF OPTICAL SPLITTER MODULES

PON system has expanded extensively as an optical network in the construction of FTTH economically. As shown in Fig. 1, PON architecture allows a signal transmitted over a single optical fiber from the telephone exchange office to be shared with multiple users, hence achieving cost reduction per subscriber. Planar Lightwave Circuit (PLC) splitter, an optical splitter is a key to realize the branching of optical signal in the telecommunication network, and currently has a maximum of 32 split ratio capability (Fiber-Mart can provide up to 64 split ratio capability).

PON system structure

The 116 and 132 splitter modules were fabricated to be mountable onto the above described fiber distribution hub. The vacant port (a port which is not in service) present in the FDH will result in back reflections of the optical signal. To prevent return loss from the end face of vacant port, SC connector is polished to an Angled Physical Contact (APC) interface. Data below tabulates the optical characteristics of the optical splitter module, inclusive of the connector pigtails.

The histograms shown in Figs. 7 and 8 illustratethe insertion loss performance of 116 and 132 optical splitter module respectively. At operating wavelength 1310 nm, the average insertion loss of 116 splitter stands at 13.23 dB while that of 132 splitter is 16.33 dB. Similarly, at 1550 nm operation wavelength, the insertion loss of 116 and 132 splitter module is 13.10 dB and 16.22 dB respectively. In addition, the standard deviation of 116 splitter is 0.29 dB while 132 splitter yields a standard deviation of 0.34dB. At the same time, this value decreases to 0.23 dB for 116 splitter and 0.28 dB for the 132 splitter at wavelength 1550 nm.

1x16 splitter insertion loss

The performances of other optical characteristics apart from insertion loss are shown in Table 1. These results show consistent good performances, as exhibited in the insertion loss histogram,

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