Light polarization beam splitter
A technology of beam splitter and light polarization, which is applied in the coupling direction of optical waveguide, can solve the problems of not very high extinction ratio, not very large bandwidth, additional loss, etc., and achieve the effect of large bandwidth, high extinction ratio and compact size
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[0026] 1. For the structure of the polarizer of the present invention, see attached figure 1 , TE 0 , TM 0 Polarized light is simultaneously passed through the Input port, that is, the width is W 1 The waveguide ports are input into this device, and they propagate independently in the waveguide, TE 0 , TM 0 The light fields are represented by dashed and solid lines, respectively.
[0027] 2. For TM 0 For input light, based on the coupled mode theory and phase matching principle, design a suitable waveguide width so that the width is W 1 In the waveguide TM 0 The propagation constant of light is equal to the width W 2 (W 1 2 ) In the waveguide TM 1 The propagation constant (β TM0 = Β TM1 ), to meet the phase matching principle, TM 0 Light can be coupled from a narrow waveguide to a wide waveguide, and by TM 0 Model converted to TM 1 Mode propagates, and the length of the wide waveguide meets the coupling length Lc1, so that the energy of the input light is maximized from W 1 Waveg...
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