A method for connecting optical fiber cables

摘要

A test piece (1) is prepared having the same metal tube (2) and metal sleeve (4) as in the case of metal tube covered optical fiber cables (10) and (20) to be connected and a sensor (5) for measuring temperatures in the vicinity of a welding part, prior to connection of the cables an optimum welding condition is set by variously changing welding conditions using the test piece (1) and measuring temperatures in the vicinity of the welding part with the sensor (5), the connection is made under such an optimum welding condition, and after this connection welding is done under one and the same condition as in the case of the connection using the other test piece (1), and then by the output of the sensor (5) it is to be made sure that the connection has been carried out almost under the same condition as the optimum welding condition. <MATH>