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**6** 

*Japan* 

**All-Optical Switch** 

Takashi Hiraga and Ichiro Ueno

*National Institute of Advanced Industrial Science & Technology* 

**The Least Stand-By Power System Using a 1x7** 

According to the explosive popularization of the internet, the infrastructure for a broadband optical network becomes very important. The most serious problem, however, for a broadband network is large energy consumption of the infrastructure. For example, over 1% of generated energy is consumed in Japan, and in the near future it will become over 10 %. An energy-saving measure, therefore, is energetically promoted in all of Japan including the government, industry and universities. Namely, an effort to save energy in homes is important, because about 50 million families are living in Japan. With the spread of "fibre to the home (FTTH)", in the future, several services such as high definition television (HDTV), will use the Internet, which will become a larger energy consumer in homes. Equipment for FTTH, which include electrical-switched devices, such as HUBs and Routers, are on standby for communication. If the energy consumption in every home decreased by 10%, it will

An optically gated optical switch without any electric parts is composed of several lenses and a dye-dissolved high-boiling-point solvent, where the absorbance of the dye for the signal light is lower than 0.1 and for the gating light is over 3. The most versatile advantage of this system is easy selection of the wavelengths for both the gating light and the signal light. The signal light, which is transparent to the dye-solution, is refracted by a temporally formed microscopic thermal-lens (region with lower refractive index) that is locally heated around a focal point by the irradiation of the gating light (Tanaka et al., 2007; Tanaka et al.,

Here, we have developed a local telecommunications system for FTTH using an optically gated optical switch composed of only optical parts. This system is suitable for a local-area network within a home. An optical-fibre line from a telephone office is directly connected to a 1x7 optically gated optical switch (Fig. 1). A terminal unit (optical interface; Opt-I/F) of the present system connected directly between a 1x7 optically gated optical switch (all-optical switch) and a PC, TV, IP-phone and so on, plays the role of a controller of 1x7 optically gated optical switch for the light-path switching of a PC, and so on. This unit sends a command to another terminal unit for negotiation among the terminal units using a 980 nm line. All terminal units connected to a 1x7 optically gated optical switch via a reflection-type optical star coupler in a 980 nm line can establish completely independently collision-free communication among the terminal units.

**1. Introduction** 

bring about surprising energy savings.

2010, Ueno et al., 2003, Ueno et al., 2007, Tanaka et al., 2010).

