Optical apparatus having a ferrule holder, a lens holder and an optical

Abstract

An optical apparatus has a protecting tube made of rubber or resin, a ferrule holder in which a ferrule connected with an optical fiber cable passing through a cable inserting hole of the protecting cap is held, a lens holder fixed to the ferrule holder, a package holder fixed to the lens holder, a protecting tube in which the ferrule holder, the lens holder and the package holder are tightly set, and a flange placed on one end of the protecting tube. An optical axis of the optical fiber cable, an optical axis of a lens held in the lens holder and an optical axis of an optical semiconductor device which is packed in a device package held in the package holder agree with a common optical axis of the optical apparatus. The protecting tube is formed by rolling up a metal plate, and the protecting tube and the flange are integrally formed. A base body of the device package face the protecting tube through an open space, so that any stress applied to the flange is not influenced on the optical semiconductor device, and the optical axes do not shift from the common axis. Also, because the protecting cap is soft and elastic, an external shock applied to the optical fiber cable is absorbed by the protecting cap, so that the optical fiber cable is not damaged.