Patent ID: 9749062
Date: 2017-08-29
CPC Classifications: H03F,H04B

Claim:
1. An optical receiver for receiving light as an optical signal, the optical receiver having an overall bandwidth and a frequency characteristic configured to support a high data transmission rate, the optical receiver comprising: a light receiver element having a bias voltage and a bandwidth, and configured to receive light and convert the received light to a current, at a low data transmission rate; a transimpedance amplifier (TIA) configured to receive and amplify the current of the light receiving element to have low noise as a TIA output signal; a frequency characteristic compensation circuit configured to: receive the TIA output signal; compensate for the frequency characteristic of the optical receiver such that the frequency characteristic of the optical receiver becomes substantially flat over the overall bandwidth capable of supporting a high data transmission rate of above 5 Gb/s; and output a compensated output signal; and a post amplifier configured to receive and amplify the compensated output signal, wherein: the frequency characteristic compensation circuit is controlled to provide a flat frequency characteristic of the optical receiver by providing frequency compensation over the overall bandwidth of the optical receiver, and while maintaining the flat frequency characteristic of the optical receiver, the bias voltage of the light receiving element is adjusted so as to expand the bandwidth of the light receiving element substantially close to the overall bandwidth of the optical receiver to support the high data transmission rate.