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BiCMOS optical transmitter driving circuit based on PAM4 modulation mode

A technology for optical transmitters and driving circuits, applied in electromagnetic transmitters, electrical components, electromagnetic wave transmission systems, etc., can solve the problem that the rate does not exceed 100Gb/s, and achieve improved data transmission rate, improved chip integration, and high cut-off The effect of frequency

Active Publication Date: 2020-07-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Internationally, Wouter Soenen and others realized a 40Gb / s long-wavelength VCSEL PAM4 transmission link in 2014 [4] ; In 2018, Abhinav Tyagi and others designed a new 2.5-tap nonlinear FFE structure, which accurately compensated each level and achieved a transmission rate of 50Gb / s [5] , but the rate of the two has not yet exceeded 100Gb / s

Method used

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  • BiCMOS optical transmitter driving circuit based on PAM4 modulation mode
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  • BiCMOS optical transmitter driving circuit based on PAM4 modulation mode

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Embodiment 1

[0043] The BiCMOS optical transmitter drive circuit based on the PAM4 modulation mode proposed by the present invention includes:

[0044] 1. Two input buffer stages provide the input impedance matching of the circuit;

[0045] 2. Two broadband amplifiers provide appropriate gain and increase bandwidth;

[0046] 3. A current mode logic (CML) adder superimposes two NRZ signals into one PAM4 signal to double the data transmission rate of a single channel;

[0047] 4. A broadband output buffer stage, while providing circuit output impedance matching, integrates two bandwidth expansion methods, effectively improving the bandwidth of the entire transmission path.

Embodiment 2

[0049] The present invention designs a PAM4 modulated high-speed optical transmitter drive circuit based on a BiCMOS process platform, realizes the synthesis of two NRZ signals and one PAM4 signal, and improves the data transmission rate under limited bandwidth.

[0050] figure 1 It is a schematic diagram of the structure of the PAM4 drive circuit. The two input signals are respectively buffered by the input buffer stage, and then amplified by the broadband amplifier. The amplified two NRZ signals are superimposed by a current mode logic (CML) adder to obtain a PAM4 signal. The PAM4 signal is buffered through the broadband output buffer stage, and the high-speed signal is output.

[0051] Described below figure 1 The specific realization form of key circuit modules in the structure diagram.

[0052] figure 2 Circuit diagram for the input buffer stage. The basic structure of the circuit is that of an improved common-emitter amplifier, V i+ and V i- connected to the inp...

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Abstract

The invention discloses a BiCMOS optical transmitter drive circuit based on a PAM4 modulation mode, and the circuit comprises two input buffer stages which are used for providing input impedance matching; the two broadband amplifiers are used for providing gain and improving bandwidth; the current mode logic adder is used for superposing the two paths of NRZ signals into one path of PAM4 signal soas to double the single-path data transmission rate; the current mode logic adder is constructed by two pairs of NMOS (N-channel metal oxide semiconductor) tubes connected with the same load resistor, so that two paths of NRZ signals are superposed into one path of PAM4 signal, and the transmission rate is doubled; and the broadband output buffer stage integrates two bandwidth expansion modes while providing circuit output impedance matching, so that the bandwidth of the whole transmission path is effectively improved. According to the invention, pure analog domain monolithic integration without a digital module is realized, a bandwidth expansion mode without an inductor is introduced, the design complexity is greatly reduced, and the chip integration degree is improved.

Description

technical field [0001] The invention relates to the field of optical transmitter driving circuits, in particular to a BiCMOS optical transmitter driving circuit based on PAM4 modulation mode. Background technique [0002] With the birth of new technologies such as big data, cloud computing, and artificial intelligence, the amount of data has shown explosive growth, and the demand for bandwidth for data communication has become increasingly strong. In particular, the current information age has entered the 5G era. Compared with the 4G era, the amount of data carried will increase by 2 to 3 orders of magnitude. The traditional optical interconnection system is electro-optic hybrid integration, in which high-speed lasers and high-speed modulators load electrical signals onto light waves, so high-speed driver chips are required to convert lasers and modulators from electrical signals to optical signals. However, due to the non-ideal effect of the transmission channel, factors s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/524H04B10/54H04B10/50
CPCH04B10/501H04B10/524H04B10/541
Inventor 谢生石岱泉毛陆虹
Owner TIANJIN UNIV