Optical transmitter drive circuit based on 3-tap feed-forward equalization pre-emphasis

Abstract

The invention discloses an optical transmitter drive circuit based on 3-tap feedforward equalization pre-emphasis, the drive circuit includes: an input buffer stage, used to provide input impedance matching; a delay unit, realized in the form of multi-stage cascading, In addition, a variable capacitor is introduced to provide time delay; the delay unit, the main signal amplifier, the positive signal compensation, and the negative signal compensation are composed of a 3-tap feed-forward equalizer to compensate for the high-frequency loss of the signal; the VCSEL drive circuit converts the obtained signal Superposition, the modulation tail current and bias current are provided by the digital-to-analog converter. The present invention further improves the transmission rate of the optical transmitter, compensates the high-frequency loss of the signal, and improves the bandwidth of the transmitting circuit under the premise of ensuring a certain bit error rate of the optical fiber communication.

Description

technical field [0001] The invention relates to the field of high-speed optical fiber communication, in particular to an optical transmitter drive circuit based on 3-tap feed-forward equalization pre-emphasis. Background technique [0002] With the rapid development of communication technology, the information age has gradually evolved into the era of big data, artificial intelligence technology has shown excellent application prospects, and the popularity of wireless sensor networks has become more and more extensive. With the continuous promotion and popularization of applications, people have higher and higher requirements on the data capacity and rate of communication networks. The International Semiconductor Technology Roadmap points out that due to the avalanche increase in information generation and transmission, the performance of existing electrical interconnections can no longer meet the growth rate of chip performance and the requirements of communication system d...

AI Technical Summary

Problems solved by technology

For example, the Southern Methodist University in the United States adopted a pre-emphasis technology combining source-level degeneration and peaking inductance to realize a 4×10Gb / s VCSEL drive array [1] , but the introduction of inductance makes the chip area too large; Fudan University and the Chinese Academy of Sciences used time continuity equalization, negative capacitance compensation, peaking inductance and feedforward equalization technology to design a 25Gb / s DFB drive circuit [2] , but the feed-forward equalization pre-emphasis only has 2 taps, the equalization effect is not ideal, and passive inductors are used in the circuit, and the chip occupies a large area

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