H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/20 (2006.01) H04B 10/207 (2006.01)
Patent
CA 2073808
ABSTRACT OF THE INVENTION Transmissive Active Fiber-Optic Star Coupler for a Network system A fiber-optic star coupler is configured by associating fiber amplifiers and passive fiber-optic star couplers to form a transmissive N*N active fiber-optic star coupler. The star coupler mainly contains 4*4 active fiber-optic star couplers and 2*2 3dB passive fiber- optic couplers acting as basic optical elements, wherein each of the 4*4 active fiber-optic star coupler is composed of six units of 2*2 3dB(or two units of 4*1 optical coupler), a dichroic coupler, an optical amplified fiber, and an optical isolator. By using a plurality of 4*4 active fiber-optic star couplers and 2*2 3dB passive fiber-optic coupler, it is possible to configure any desired configuration of transmissive N*N active fiber- optic star coupler. The number N may be any integral power of 2. The coupler in such a configuration uses less pumping sources and associated optical elements, and has the advantages of compensating the splitting loss and excess loss of the coupler, and therefore making it possible to expand the amount of connected terminals. As a result, the cost of the coupler may be reduced by 60% comparing to that of the prior art. In addition, the coupler can adapt to various pumping sources with different wavelength to meet the real demands and conditions of the network system (FIG.1B)
Chen Yung-Kuang
Liaw Jy-Wang
Gowling Lafleur Henderson Llp
Ministry Of Communications Telecommunication Laboratories Directorate General Of Telecommun
LandOfFree
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