High-speed optical receiver having transmission rate of 25 Gbps

Abstract

The invention relates to an optical fiber communication technology, specifically to a high-speed optical receiver having a transmission rate of 25 Gbps. The optical receiver comprises an input photocurrent signal, a trans-resistance amplifier, a Dummy, a first-stage limiting amplifier, a second-stage limiting amplifier, an output buffer stage and DC offset cancellation circuit; the trans-resistance amplifier is connected to the input photocurrent signal, the Dummy and the first-stage limiting amplifier respectively, the Dummy is connected to the first-stage limiting amplifier, the first-stagelimiting amplifier is connected to the second-stage limiting amplifier, the second-stage limiting amplifier is connected to the output buffer stage and the DC offset cancellation circuit respectively, and the DC offset cancellation circuit is connected to the trans-resistance amplifier and the Dummy respectively. The input of the receiver adopts the form of pseudo-differential, which reduces thecommon mode noise, eliminates the disturbance caused by the inner lead coupling, improves the sensitivity and stability of the circuit, and obtains a large output swing; and a small DC offset can be maintained while the input current is high, so that the dynamic range of the circuit is increased to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, in particular to a high-speed optical receiver with a transmission rate of 25Gbps. Background technique [0002] Optical fiber communication has large bandwidth, large communication capacity, good anti-interference performance, and low overall cost, which is the inevitable direction of communication development. With the development of diverse communication requirements such as cloud storage, big data, and the Internet of Things, the bandwidth of optical fiber communication continues to increase, and the development of high-speed optical fiber systems is imminent. In a typical optical fiber communication system, the optical transmitter is responsible for the generation and transmission of optical signals, the optical fiber channel is responsible for the transmission of optical signals, and the optical receiver is responsible for the reception of optical signals, including phot...

AI Technical Summary

Problems solved by technology

Optical receivers usually need a large enough bandwidth to meet the needs of data transmission, but too large a bandwidth usually increases the accumulation of noise and affects the sensitivity of the optical receiver; optical receivers usually use some methods to increase the bandwidth technologies, such as capacitor degeneracy technology, inductance peaking technology, etc., but such technologies usually make the gain-bandwidth curve have a large peak

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