| 摘要 |
The invention relates to an optical device, having high reliability, which is free from any breakage of optical fibers in line with changes in temperature. A laser diode element 1 is disposed in a metal-made package 9, the tip end side of a lensed fiber 2 having a lens 3 formed at the tip end side of the optical fiber is inserted into and fixed at the first ferrule 5, and the first ferrule 5 is fixed on the base 10. The second ferrule 6 is provided at the rear end side of the first ferrule 5 via a spacing, and is inserted into and fixed in the insertion portion 20 of the package 9. And, an intermediate portion of the lensed fiber 2 is inserted into and fixed at the second ferrule 6. A deflection 14 is provided at the lensed fiber 2 between the first ferrule 5 and the second ferrule 6, shown in FIG. 1A, at a temperature lower than the upper limit of the environmental temperature for use. The deflection 14 is used as a means for preventing a tensile strain exceeding the allowable range from being applied to the lensed fiber 2 between the first ferrule 5 and the second ferrule 6 at the upper limit of the environmental temperature for use.
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