Control of light emitting and receiving elements of optical module based on property data associated with elements as stored on memory circuit of optical module
The present invention provides an optical module, a host board, and a method of manufacturing the host board, where the number of man-hours required for manufacture has been reduced. Accordingly, the present invention need not have such type of optical transceiver module as the conventional host board since the host board on which the optical module has been mounted may automatically perform a control corresponding to property data of a light emitting element and a light receiving element by mounting a memory circuit on the optical module. As a result, it may be achieved to provide an optical module, a host board, and a method of manufacturing the host board, where the number of man-hours required for manufacture has been reduced.
1. A host board comprising:
an optical module including:
a light emitting element,
a light receiving element, and
a memory circuit that stores property data associated with a property of the light emitting element and the light receiving element, the property data including a current-to-optical conversion efficiency, a light emitting critical value, and temperature variation properties for the light emitting element, and an optical-to-current conversion efficiency, a breakdown voltage, and temperature variation properties for the light receiving element; and
a first control circuit that controls the light emitting element and the light receiving element based on the property data when the optical module is mounted on the host board,
wherein the first control circuit is to provide a modulation current and a bias current to the light emitting element, based on the current-to-optical conversion efficiency, the light emitting critical value, and the temperature variation properties for the light emitting element stored in the memory circuit, and also based on a desired optical output power and a desired extinction ratio of the light emitting element,
wherein the first control circuit is further to generate a reverse bias voltage of the light receiving element based on the optical-to-current conversion efficiency, the breakdown voltage, and the temperature variation properties for the light receiving element stored in the memory circuit,
wherein the memory circuit, the light emitting element, and the light receiving element are all mounted on and are part of the optical module, whereas the first control circuit is not part of the optical module but rather is connected to the optical module on the host board,
and wherein no adjustment of the optical module is necessary for the optical module to function.
2. The host board of claim 1 , further comprising:
a second control circuit that controls an output of the light emitting element based on an output of the light receiving element.
3. The host board of claim 1 , wherein
the first control circuit calculates a parameter that controls the light emitting element and the light receiving element in real time.
4. The host board of claim 1 , wherein
the first control circuit includes a conversion efficiency S as a parameter.
5. A method of manufacturing a host board comprising:
a step of preparing an optical module including a light emitting element, a light receiving element, and a memory circuit that stores property data associated with a property of the light emitting element and the light receiving element, the property data including a current-to-optical conversion efficiency, a light emitting critical value, and temperature variation properties for the light emitting element, and an optical-to-current conversion efficiency, a breakdown voltage, and temperature variation properties for the light receiving element;
a step of preparing a board for the host board including a first control circuit that controls the light emitting element and the light receiving element based on the property data when the optical module is mounted on the host board and a second control circuit that controls an output of the light emitting element based on an output of the light receiving element; and
a step of mounting the optical module on the board,
wherein the first control circuit is to provide a modulation current and a bias current to the light emitting element, based on the current-to-optical conversion efficiency, the light emitting critical value, and the temperature variation properties for the light emitting element stored in the memory circuit, and also based on a desired optical output power and a desired extinction ratio of the light emitting element,
wherein the first control circuit is further to generate a reverse bias voltage of the light receiving element based on the optical-to-current conversion efficiency, the breakdown voltage, and the temperature variation properties for the light receiving element stored in the memory circuit,
wherein the memory circuit, the light emitting element, and the light receiving element are all mounted on and are part of the optical module, whereas the first control circuit is not part of the optical module but rather is connected to the optical module on the host board,
and wherein no adjustment of the optical module is necessary for the optical module to function.