Patent ID: 11921333
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Optics (Instruments)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A wavelength-selective optical reception device, comprising:
a photoreceptor that converts first optical signals into electric signals and outputs the electric signals;
a base on which the photoreceptor is provided;
a housing that is mounted on the base and surrounds the photoreceptor along with the base, and that is provided with a first window through which third optical signals pass from an outside of the housing to an inside of the housing, the third optical signals including the first optical signals and including second optical signals of a wavelength different from a first wavelength of the first optical signals; and
a first optical filter that is disposed inside the housing between the first window and the photoreceptor along an optical axis of the third optical signals, and that outputs, out of the third optical signals that enter thereto, the first optical signals toward the photoreceptor, and reflects the second optical signals toward a near side in a direction of travel of the third optical signals,
wherein a second window is provided at the housing, and the second optical signals pass through the second window from the inside of the housing to the outside of the housing,
the first window is either a first plate-like material or a first opening that is provided at a first position of an outer peripheral wall of the housing,
the second window is either a second plate-like material or a second opening that is provided at a second position of the outer peripheral wall of the housing, and
a shielding member is provided between the first window and the second window at a third position of the outer peripheral wall of the housing.