Patent ID: 7668469
Filing Date: 2010-02-23
Classification: H04B

Abstract:
1. 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 generator unit, the comparator unit being configured to compare the bias voltage with a preset reference, the generator unit being configured to form a switching signal based on the comparison in the comparator unit; 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, the bias voltage including a control signal for varying the conversion gain and the frequency bandwidth of the pre-amplifier, wherein the comparator unit extracts the control signal by pausing a preset period after the bias voltage intersects a trigger voltage.