Patent ID: 9455790
Filing Date: 2016-09-27
CPC Classification: H03F,H04B

Claim Text:
1. A high-speed optical receiver for receiving light as an optical signal, the high-speed optical receiver having an overall bandwidth and a frequency characteristic configured to support a high data transmission rate, the high-speed optical receiver comprising: an avalanche photo diode (APD) or PIN diode having a bias voltage and a bandwidth, acting as a light receiving element configured to receive light and convert the received light to a current, at a data transmission rate; a transimpedance amplifier (TIA) configured to receive and amplify the current of the APD or PIN diode to have low noise as a TIA output signal; a frequency characteristic compensation circuit configured to: a post amplifier configured to receive and amplify the compensated output signal to a signal with an amplitude usable by a digital element, wherein: the bias voltage of the APD or PIN diode is adjusted to a predetermined value so as to expand the bandwidth of the APD or PIN diode substantially close to the overall bandwidth of the high-speed optical receiver, and the frequency characteristic compensation circuit is controlled to provide a substantially flat frequency characteristic of the high-speed optical receiver by providing frequency compensation over the overall bandwidth of the high-speed optical receiver, while maintaining the bias voltage of the APD or PIN diode at the predetermined value.