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US 7,248,801 B2Granted
Bidirectional optical communications module
AssigneeSharp Kabushiki Kaisha
InventorsHideaki Fujita, Yorishige Ishii, Toshihiro Tamura
Life of this patent
Estimating the term…
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.
Claims20
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,
- wherein the second outgoing light control section is formed continuously to a periphery of the first outgoing light control section, and the second outgoing light control section guides the second outgoing light outside the end face of the optical communications path element by refracting the second outgoing light.
4 more elements
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,
- wherein the second outgoing light control section is formed continuously to a periphery of the first outgoing light control section, and the second outgoing light control section guides the second outgoing light outside the end face of the optical communications path element by reflecting the second outgoing light.
4 more elements
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,
- wherein the second outgoing light control section is formed continuously to a periphery of the first outgoing light control section, the second outgoing light control section is arranged from a prism, and the second outgoing light control section has a shape such that the first outgoing light control section is placed in a center of a conical dent carved out of a cylinder.
4 more elements
A bidirectional optical communications module for bidirectionally communicating with another party,
- 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,
- wherein the second outgoing light control section is formed continuously to a periphery of the first outgoing light control section, the second outgoing light control section is arranged from a lens, and the second outgoing light control section has a shape such that the first outgoing light control section is placed in a center of a hemispheric dent carved out of a cylinder.
4 more elements
A bidirectional optical communications module for bidirectionally communicating with another party,
- 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;
- an incoming light control section including a first face and a second face which is an opposite face to the first face, the first face reflecting incoming light so as to collect the reflected incoming light to the light-receiving device, the second face reflecting light hitting the second face so as to prevent the light hitting the second face from hitting the light-receiving device;
- 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,
- wherein a path of the second outgoing light is different from a path which is from the light emitting device to the second face of the incoming light control section.
5 more elements
Dependencies are inferred from the claim text.