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Secondary emission in physics is a phenomenon where primary incident particles of sufficient energy, when hitting a surface or passing through some material, induce the emission of secondary particles. The term often refers to the emission of electrons when charged particles like electrons or ions in a vacuum tube strike a metal surface; these are called secondary electrons. In this case, the number of secondary electrons emitted per incident particle is called secondary emission yield. If the secondary particles are ions, the effect is termed secondary ion emission. Secondary electron emission is used in photomultiplier tubes and image intensifier tubes to amplify the small number of photoelectrons produced by photoemission, making the tube more sensitive. It also occurs as an undesirable side effect in electronic vacuum tubes when electrons from the cathode strike the anode, and can cause parasitic oscillation.
Analog signal processing-based dispersion analog transmission link and dispersion analog method
The application belongs to the field of optical fiber communication, and discloses a dispersion simulation transmission link and a dispersion simulation method based on analog signal processing. The dispersion simulation transmission link comprises a coherent transmitter, an IQ modulator, lasers with different wavelengths, an interference receiving chip (ICR), a Bragg dispersion compensation grating (FBG-DCM) and a coherent receiver. Data is sent from the coherent transmitter, first passes through the ICR to convert the optical field into the electrical domain, and is modulated into a new optical field by the IQ modulator. The output end of the ICR has two optional paths. The first path is connected to the IQ modulator, uses the secondary emission of intrinsic light with different wavelengths, and converts the wavelength to the FBG-DCM compensation window. After the above steps, the original wavelength is converted by the IQ modulator after being received by the ICR for transmission, so that the superposition of negative dispersion is realized. The second path is connected to the IQ modulator, uses the secondary emission of intrinsic light with different wavelengths, realizes the phase conjugation and converts to the FBG-DCM compensation window at the same time. After the above steps, the ICR receives and realizes the superposition of positive dispersion.
Owner:HUAZHONG UNIV OF SCI & TECH