Abstract: It is to provide an optical element, an optical module, an optical connector, and an optical module manufacturing method that can quickly and very accurately control the amount of outgoing light to a desired amount when incident light is outputted, reduce costs, and enhance manufacturing efficiency. A diffraction grating 9 having a periodic structure made from a plurality of grating grooves 10 and formed to allow control of an amount of outgoing light using polarization-dependent characteristics when incident light is outputted as the outgoing light and a mark 11 indicating at least one of either a grating groove 10 direction of the diffraction grating 9 or a periodic direction of the diffraction grating 9 are included.

Abstract: An optical module capable of preventing the efficiency of optical coupling from deteriorating even if temperature varies. The optical module 1 has a holder 2 and an aspherical lens 11, which are formed of a plastic so as to be integrated with each other. The holder 2 has a cylindrical portion 8 which engages a photoelectric transfer element package 3. The photoelectric transfer element package 3 has a flange portion 15 which butts the open end face 16 of the cylindrical portion 8. The flange portion 15 is bonded to the open end face 16 of the cylindrical portion 16, and a gap is formed between the outer peripheral surface 18 of the cap 12 of the photoelectric transfer element package 3 and the inner peripheral surface of the cylindrical portion 8.

Abstract: After a tolerance of width B during the mounting of a photoelectric transfer element 8 is previously set, a holder 3 is formed so that a dimensional error A on the end portion of the holder 3 on the side of the photoelectric transfer element 8 in directions parallel to an optical axis 4 satisfies a condition of A<B with respect to the tolerance of width B, and then, a substrate 9 on which the photoelectric transfer element 8 is mounted is caused to contact the end face of the holder 3 on the side of the photoelectric transfer element 8 to form an optical module 1.

Abstract: There is provided an optical module capable of preventing the efficiency of optical coupling from deteriorating even if temperature varies. The optical module 1 has a holder 2 and an aspherical lens 11, which are formed of a plastic so as to be integrated with each other. The holder 2 has a cylindrical portion 8 which engages a photoelectric transfer element package 3. The photoelectric transfer element package 3 has a flange portion 15 which butts the open end face 16 of the cylindrical portion 8. The flange portion 15 is bonded to the open end face 16 of the cylindrical portion 16, and a gap is formed between the outer peripheral surface 18 of the cap 12 of the photoelectric transfer element package 3 and the inner peripheral surface of the cylindrical portion 8.

Abstract: There is provided an optical module capable of improving assembling efficiency and reducing the number of parts to reduce production costs, and an optical connector having the same. The optical module has a holder 3, a lens 12 and a diffraction grating 13 for damping the quantity of light. The holder 3, the lens 12 and the diffraction grating 13 are formed of a resin material so as to be integrated with each other. The diffracting grating 13 is designed to prevent high-order diffracted light beams from being coupled with an optical fiber 8.

Abstract: After a tolerance of width B during the mounting of a photoelectric transfer element 8 is previously set, a holder 3 is formed so that a dimensional error A on the end portion of the holder 3 on the side of the photoelectric transfer element 8 in directions parallel to an optical axis 4 satisfies a condition of A<B with respect to the tolerance of width B, and then, a substrate 9 on which the photoelectric transfer element 8 is mounted is caused to contact the end face of the holder 3 on the side of the photoelectric transfer element 8 to form an optical module 1.

Abstract: There is provided an optical module capable of improving assembling efficiency and reducing the number of parts to reduce production costs, and an optical connector having the same. The optical module has a holder 3, a lens 12 and a diffraction grating 13 for damping the quantity of light. The holder 3, the lens 12 and the diffraction grating 13 are formed of a resin material so as to be integrated with each other. The diffracting grating 13 is designed to prevent high-order diffracted light beams from being coupled with an optical fiber 8.

Abstract: There is provided an optical module capable of preventing the efficiency of optical coupling from deteriorating even if temperature varies. The optical module 1 has a holder 2 and an aspherical lens 11, which are formed of a plastic so as to be integrated with each other. The holder 2 has a cylindrical portion 8 which engages a photoelectric transfer element package 3. The photoelectric transfer element package 3 has a flange portion 15 which butts the open end face 16 of the cylindrical portion 8. The flange portion 15 is bonded to the open end face 16 of the cylindrical portion 16, and a gap is formed between the outer peripheral surface 18 of the cap 12 of the photoelectric transfer element package 3 and the inner peripheral surface of the cylindrical portion 8.