OPTICAL TRANSMITTER

摘要

An optical transmitter includes four LDs, four LDDs that drive the LDs, four monitoring PDs that convert some of optical signals emitted from the LDs to electrical sisals and output them, a controller that controls the LDDs in response to the electrical monitoring signals generated by the monitoring PDs, and a switch that receives the electrical monitoring signals though signal lines from the monitoring PDs and electrically connects only a selected signal line selected by the controller to the controller. The controller outputs a selection signal that selects the selected signal line from the signal lines is order to the switch, and controls the LDDs so that an optical power of the LD corresponding to the PD approaches a predetermined value, according to the electrical monitoring signal outputted from the PD corresponding to the selected signal line.

主权项

1. An optical transmitter comprising:
at least two laser diodes (LDs) configured to generate respective optical signals in response to respective driving signals; driving circuits configured to generate the respective driving signals; photo detectors (PDs) configured to convert the respective optical signals to respective first electrical signals and output the respective first electrical signals; a switch configured to select one of the respective first electrical signals according to a selection signal and configured to output the one of the respective first electrical signals as a second electrical signal; and a controller configured to generate the selection signal and control one of the driving circuits in response to the second electrical signal so as to maintain intensity of one of the respective optical signals at a predetermined value, the one of the respective optical signals being generated by one of the at least two LDs that is driven by the one of the driving circuit.