| 摘要 |
Disclosed is an optical branching and coupling device of high quality which is prevented from malfunction, corrosion and deterioration due to condensation on optical components incorporated therein by virtue of perfect sealing. The optical branching and coupling device including a housing provided with an aperture, optical instruments, associated with the housing, for branching, coupling, transmitting and receiving optical information input to the device, and an aspherical lens inserted into the aperture and fixed thereto by hermetic sealing with a glass material, the aspherical lens being adapted to connect at an end face thereof with at least one optical fiber.
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