Abstract: A heat bolt unit according to one embodiment includes a plurality of heat bolts disposed in parallel to one another, and a holding portion that holds the plurality of heat bolts. The holding portion holds a base end portion of each of the plurality of heat bolts disposed in parallel to one another. In other words, the holding portion holds the plurality of heat bolts disposed in parallel to one another in a cantilever manner.

Abstract: A variable attenuator is inserted into an optical input part and a feedback control is performed so that an optical input to an amplifying optical fiber becomes constant. Further, a control for changing a total optical output and an optical input to the amplifying optical fiber is performed on the basis of channel number information obtained from a supervisory signal. When light to/from an intermediate optical component is detected and the absence of the component is detected, pumping is suppressed, thereby avoiding occurrence of an optical surge at the time of connection of the optical component and a signal indicative of detachment of the optical component is generated.

Abstract: A variable attenuator is inserted into an optical input part and a feedback control is performed so that an optical input to an amplifying optical fiber becomes constant. Further, a control for changing a total optical output and an optical input to the amplifying optical fiber is performed on the basis of channel number information obtained from a supervisory signal. When light to/from an intermediate optical component is detected and the absence of the component is detected, pumping is suppressed, thereby avoiding occurrence of an optical surge at the time of connection of the optical component and a signal indicative of detachment of the optical component is generated.

Abstract: A combination of a bottle (1) and a closure (2) for containing a drink, having an improved sealability. The bottle (1) is produced by a blow-molding process with a resin comprised mainly of a polyethylene terephthalate, so that a bottle neck (3) is in a non-crystalline state while a bottle body (5) is given an improved heat durability by a bi-axial orientation followed by a heat treatment for relaxation. The closure (2) is made of a thermoplastic resin such a a polyolefin and provided with a top wall and a side wall having a thread (7) on the inner surface (9) thereof corresponding to a thread (4) on the outer surface (12) of the bottle neck (3).