OPTICAL COMMUNICATION MODULE, OPTICAL NETWORK UNIT, AND METHOD OF CONTROLLING LIGHT-EMITTING ELEMENT

摘要

An optical communication module includes a modulation current supply circuit for supplying to a light-emitting element for transmitting a burst optical signal, a modulation current having magnitude in accordance with a logical value of data to be transmitted, a light-receiving element for monitoring, for outputting a current in accordance with intensity of light received from the light-emitting element, a measurement unit for measuring an output current from the light-receiving element for monitoring at set measurement timing, an adjustment unit for adjusting magnitude of the modulation current based on a result of measurement of the output current by the measurement unit, and a measurement timing setting unit for setting measurement timing based on a control signal for controlling transmission of the burst optical signal.

主权项

1. An optical communication module, comprising:
a modulation current supply circuit for supplying to a light-emitting element for transmitting a burst optical signal, a modulation current having magnitude in accordance with a logical value of data to be transmitted; a light-receiving element for monitoring, for outputting a current in accordance with intensity of light received from said light-emitting element; a measurement unit for measuring an output current from said light-receiving element for monitoring at set measurement timing; an adjustment unit for adjusting magnitude of said modulation current based on a result of measurement of said output current by said measurement unit; and a measurement timing setting unit for setting said measurement timing based on a control signal for controlling transmission of said burst optical signal, said measurement unit including a sample-and-hold circuit sampling said output current or a value corresponding to said output current within said measurement timing set by said measurement timing setting unit and holding a sampled value outside said measurement timing, said measurement timing setting unit including a delay circuit generating said measurement timing from said control signal, and said measurement timing being included at least in part in a prescribed section in which said modulation current is not supplied to said light-emitting element.