Patent ID: 7917043

Claim:
An optical receiver for receiving an optical signal with a plurality of transmission speeds and for outputting an electrical signal corresponding to the optical signal, comprising: a photodiode for generating photocurrent corresponding to the optical signal; a pre-amplifier for converting the photocurrent into the electrical signal with a conversion gain and a frequency bandwidth; a control block including a comparator unit and a counter unit, the comparator unit being configured to extract a pulse signal, the counter unit being configured to count a number of pulses extracted by the comparator unit and to generate a switching signal based on the number of pulses; and a package for enclosing the photodiode, the pre-amplifier and the control block, the package providing a lead pin for supplying a bias voltage to the photodiode and to the control block, wherein the switching signal varies the conversion gain and the frequency bandwidth of the pre-amplifier.