Semiconductor laser module

Abstract

A receptacle type semiconductor laser module (TOSA) includes a semiconductor laser, a lens, and a fiber stub. The fiber stub has a slantwise cut surface to which a emission light emitted from the semiconductor laser and passing through the lens is incident. The cut surface is arranged in a position deviated from the focus of the lens in the direction of the optical axis of the fiber stub. The semiconductor laser module further includes a fixed optical attenuator arranged on a path of an emission light of the semiconductor laser and having an incident surface being oblique to an optical axis of the semiconductor laser. By such a configuration, a coupling fluctuation caused by an eccentricity of the optical fiber cord connected to the fiber stub and a near-end reflection can be suppressed.

Dependencies are inferred from the claim text.