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Incoherent holographic camera based on Michelson Interferometer
摘要： Incoherent holography is a hybrid imaging technology with coherent and incoherent processes. Compared with coherent holography, incoherent holography can alleviate coherent noise and speckle noise, and thus achieve higher signal-to-noise ratio. In this article, the incoherent holographic camera based on Michelson interferometer is built, which consists of a telescope, a beam-splitting cube, two plane mirrors, two lenses and a monochromatic charge coupled device. The Point Spread Function (PSF) of the system is determined for the first time according to the Fresnel diffraction theory. Both the simulated and experimental 2D PSFs are coincident with each other. The three-step generalized phase shift interferometry instead of the piezo-actuator is used to eliminate zero-order and twin images. The two one-jiao coins with 15mm apart and a toy house are recorded under xenon lamp illuminated. The reconstructed image clearly demonstrates the system has the ability to obtain spatial 3D information of an object.
关键词： Incoherent holography,Michelson interferometer,Generalized phase-shift interferometry
更新于2025-09-04 15:30:14
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Partial Differential Phase Shift Keying – Theory and Motivation
摘要： Recently it was demonstrate that partial Differential Phase Shift Keying (i.e., when the delay inside the Delay Interferometer is shorter than the symbol period) can partially compensate the signal deformation caused by spectrally narrowing the optical channel (by interleavers, add-drop elements, Wavelength Division Multiplexing filters, etc.). In this paper the source of this effect is investigated with numerical simulations and, to the best of our knowledge for the first time, analytically. We found that our analytical analysis matched the simulation results with high accuracy. Furthermore, a phenomenological relation, which relates the optimum Free Spectral Range to the channel bandwidth, was derived.
关键词： Differential Phase Shift Keying,Free Spectral Range,Delay Interferometer,fiber optics
更新于2025-09-04 15:30:14
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PHOTONIC ANALYSIS OF SEMICONDUCTOR FIBONACCI SUPERLATTICES: PROPERTIES AND APPLICATIONS
摘要： In this paper, we theoretically study the phase treatment of re?ected waves in one-dimensional Fibonacci photonic quasicrystals composed of nano-scale fullerene and semiconductor layers. The dependence of the phase shift of re?ected waves for TE mode and TM mode on the wavelength and incident angle is calculated by using the theoretical model based on the transfer matrix method in the infrared wavelength region. In the band gaps of supposed structures, it is found that the phase shift of re?ected wave changes more slowly than within the transmission band gaps. Furthermore, the phase shift decreases with the incident angle increasing for TE mode, and increases with the incident angle increasing for TM mode. Also, for the supposed structures it is found that there is a band gap which is insensitive to the order of the Fibonacci sequence. These structures open a promising way to fabricate subwavelength tunable phase compensators, very compact wave plates and phase-sensitive interferometry for TE and TM waves.
关键词： Fibonacci photonic quasicrystals,TE mode,semiconductor layers,infrared wavelength region,fullerene,phase shift,transfer matrix method,TM mode
更新于2025-09-04 15:30:14