Optical receiver based on a decision feedback equalizer

摘要

An optical receiver, a method of operating an optical receiver, a correction based transimpedance amplifier circuit, and a method of adjusting an output of a transimpedance amplifier. In one embodiment, the optical receiver comprises an optical-to-electrical converter, a transimpedance amplifier, and a correction circuit. The optical-to-electrical converter is provided for receiving an optical signal and converting the optical signal to an electrical signal. The transimpedance amplifier is provided for receiving the electrical signal from the optical-to-electrical converter and for generating from the electrical signal an amplified electrical signal. The amplified electrical signal has inter symbol interference resulting from a reduced bandwidth of the transimpedance amplifier. The correction circuit is provided for receiving the amplified electrical signal from the transimpedance amplifier and for generating, from the amplified electrical signal, an output signal including corrections for the inter symbol interference in the amplified electrical signal effectively increasing a bandwidth of the optical receiver.

主权项

1. An optical receiver comprising:
an optical-to-electrical converter for receiving an optical signal and converting the optical signal to an electrical signal; a transimpedance amplifier for receiving the electrical signal from the optical-to-electrical converter and for generating from said electrical signal an amplified electrical signal, said amplified electrical signal having inter symbol interference resulting from a reduced bandwidth of the transimpedance amplifier; and a correction circuit for receiving the amplified electrical signal from the transimpedance amplifier and for generating, from the amplified electrical signal, an output signal including corrections for the inter symbol interference in the amplified electrical signal effectively increasing a bandwidth of the optical receiver; and wherein: the correction circuit converts the amplified electrical signal from the transimpedance amplifier to the output signal using an adjustable decision threshold level; and the correction circuit adjusts said adjustable decision threshold, to compensate for the inter symbol interference in said amplified electrical signal, on the basis of samples of the amplified electrical signal from the transimpedance amplifier.