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Polarization independent 1550 nanometer high-diffraction-efficiency double-layer transmission grating

A technology of diffraction efficiency and transmission grating, applied in the direction of diffraction grating, etc., to achieve the effect of simple structure and good manufacturing process tolerance

Inactive Publication Date: 2013-10-23
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as we know, no one has proposed a high-efficiency double-layer structure transmission grating for the 1550 nm band

Method used

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  • Polarization independent 1550 nanometer high-diffraction-efficiency double-layer transmission grating
  • Polarization independent 1550 nanometer high-diffraction-efficiency double-layer transmission grating
  • Polarization independent 1550 nanometer high-diffraction-efficiency double-layer transmission grating

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Embodiment 1

[0024] The polarization-independent high-diffraction-efficiency double-layer transmission grating is composed of a quartz substrate and a rectangular grating 3 integrally. The period of the rectangular grating 3 is 1064 nanometers and the duty ratio is 0.64. The rectangular grating 3 has two layers: the outer grating 1 is a low refractive index material SiO 2 (refractive index 1.45), thickness is 377 nanometers; inner layer grating 2 is high refractive index material Si 3 N 4 (Refractive index 1.99), thickness is 1426 nanometers. Such as figure 2 When the incident angle is 46.76°, in the range of 1500-1610 nm, the -1 order transmittance of the grating TE and TM polarization is high, higher than 96%, covering the C+L band commonly used in optical fiber communication (1512-1601 nm ). In particular, at a wavelength of 1550 nm, the transmittance is higher than 98%. Such as image 3 As shown, when the incident wavelength is 1550 nanometers, the TE, TM light-level 1 transmitt...

Embodiment 2

[0026] The polarization-independent high-diffraction-efficiency double-layer transmission grating is composed of a quartz substrate and a rectangular grating 3 integrally. The period of the rectangular grating 3 is 1100 nanometers and the duty ratio is 0.61. The rectangular grating 3 has two layers: the outer grating 1 is a low refractive index material SiO 2 (refractive index 1.46), thickness is 369 nanometers; inner layer grating 2 is high refractive index material HfO 2 (refractive index 1.96), thickness is 1458 nanometers. Such as Figure 4 At an incident angle of 46.76°, the -1st order transmission of the grating is higher than 95% in the range of 1500-1610 nm for both TE and TM polarizations.

Embodiment 3

[0028] The polarization-independent high-diffraction-efficiency double-layer transmission grating is composed of a quartz substrate and a rectangular grating 3 integrally. The period of the rectangular grating 3 is 1040 nanometers and the duty ratio is 0.637. The rectangular grating 3 has two layers: the outer grating 1 is a low refractive index material SiO 2 (refractive index 1.46), thickness is 377.7 nanometers; inner layer grating 2 is high refractive index material Ta 2 o 5 (refractive index 2.04) and a thickness of 1410 nanometers. Such as Figure 5 At an incident angle of 46.76°, the -1st order transmission of the grating is higher than 95% in the range of 1500-1610 nm for both TE and TM polarizations.

[0029] The double-layer transmission grating with polarization-independent high-diffraction efficiency in the 1550 nm band of the present invention has high transmittance for both TE and TM polarized light, and has the advantages of flexible use and wide bandwidth. I...

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Abstract

The invention relates to a polarization independent 1550 nanometer high-diffraction-efficiency double-layer transmission grating, which is characterized by integrally consisting of a quartz substrate and a rectangular grating, wherein the period of the rectangular grating is 1000 to 1100 nanometers, the duty ratio is 0.57 to 0.655, the rectangular grating comprises an outer layer grating and an inner layer grating, the outer layer grating is made of a low-refraction-index materials and is in thickness being 350 to 414 nanometers, the inner layer grating is made of a high-refraction-index materials and is in thickness being 1410 to 1480 nanometers. When the incident angle of the double-layer transmission grating is 46.645 degrees, the -1 grade diffraction efficiency in TE (transverse electric) and TM (transverse magnetic) polarization directions can be simultaneously higher than 96 percent in the range of 1525 to 1575 nanometers, and the free selection of polarization modes is realized. The double-layer transmission grating has the advantages that the structure is simple, the preparation process tolerance is better, the mass production can be realized, and the double-layer transmission grating has the important practical prospect in the field of optical fiber communication.

Description

technical field [0001] The invention relates to a rectangular grating, in particular to a polarization-independent 1550 nanometer high diffraction efficiency double-layer transmission grating. Background technique [0002] In the field of laser communication, dense wavelength division multiplexing technology has greatly improved the capacity of laser communication, and its application has greatly reduced the communication channel interval. The realization of dense wavelength division multiplexing mainly relies on devices such as thin-film filters, arrayed waveguide gratings, fiber Bragg gratings, and free-space diffraction gratings. In comparison, the free-space diffraction grating has more prominent advantages, such as low loss, weak inter-channel interference, relatively stable work and low production cost. In an integrated optical system, the small structural size of the device makes it highly sensitive to polarization, and many devices can only achieve good functions fo...

Claims

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Application Information

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IPC IPC(8): G02B5/18
Inventor 关贺元晋云霞刘世杰易葵邵建达
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI