Optical module

An optical module comprising:

• an optical functional element configured to output a first light beam;
• a first optical part configured to receive the first light beam, have a predetermined effect on the first light beam, and output the affected first light beam as a second light beam;
• a second optical part configured to receive the second light beam, have a predetermined effect on the second light beam, output the affected second light beam as a third light beam, and reflect a reflected light beam in a direction not coupled to the first optical part, the reflected light beam being generated from the second light on an incident surface on which the second light beam is incident;
• a housing accommodating the optical functional element, the first optical part, and the second optical part;
• and
• an optical attenuator provided inside the housing and configured to attenuate power of the reflected light beam incident on the optical attenuator in the housing,
• wherein the optical attenuator is provided to a part of the housing and is configured to attenuate the reflected light beam by scattering, absorption, or transmission, and
• wherein the optical attenuator is formed by performing a surface treatment on the part of the housing.

An optical module comprising:

• an optical functional element configured to output a first light beam;
• a first optical part configured to receive the first light beam, have a predetermined effect on the first light beam, and output the affected first light beam as a second light beam;
• a second optical part configured to receive the second light beam, have a predetermined effect on the second light beam, output the affected second light beam as a third light beam, and reflect a reflected light beam in a direction not coupled to the first optical part, the reflected light beam being generated from the second light on an incident surface on which the second light beam is incident;
• a housing accommodating the optical functional element, the first optical part, and the second optical part;
• and
• an optical attenuator provided inside the housing and configured to attenuate power of the reflected light beam incident on the optical attenuator in the housing,
• wherein the optical attenuator is provided to a part of the housing and is configured to attenuate the reflected light beam by scattering, absorption, or transmission, and
• wherein the optical attenuator is a translucent window provided to the part of the housing.