Bidirectional optical communications module
AssigneeSharp Kabushiki Kaisha
InventorsHideaki Fujita, Yorishige Ishii, Toshihiro Tamura
Life of this patent
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Abstract
In a bidirectional optical communications module capable of all-dual-mode communications using a single optical fiber, interference due to internally scattered light is reduced by forming a diverging area on a periphery of a transmission lens and providing a thin film reflection mirror which collects incoming light. A inexpensive, compact bidirectional optical communications module can be offered with reduced interference between outgoing and incoming light, especially, interference due to internally scattered light.
Claims17
A bidirectional optical communications module for bidirectionally communicating with another party, comprising:
- a single optical communications path element having an optical communications path in which an optical signal travels;
- a light-emitting device for transmitting an optical signal by causing light to enter the optical communications path through an end face of the optical communications path element;
- a light-receiving device for receiving an optical signal by receiving incoming light exiting the optical communications path through the end face of the optical communications path element;
- a first outgoing light control section which receives, of light emitted by the light-emitting device, first outgoing light to be transmitted and which controls the first outgoing light so that the first outgoing light emitted by the light-emitting device enters the optical communications path through the end face of the optical communications path element;
- and
- a second outgoing light control section which receives, of light emitted by the light-emitting device, second outgoing light not to be transmitted and which controls the second outgoing light so that at least part of the second outgoing light enters neither the optical communications path which receives the first outgoing light nor the end face of the optical communications path element.
Dependencies are inferred from the claim text.