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Adjustable Optical Attenuator

A technology of dimming attenuation and fiber collimator, which is applied in the field of optoelectronics, can solve the problems of reducing contrast, light energy utilization, and increasing costs, and achieves the effects of simple and efficient preparation, stable performance, and a wide range of working wavelengths

Active Publication Date: 2016-04-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, ordinary liquid crystal devices require an alignment layer for pre-alignment, which not only increases the cost, but also produces a residual phase in the optical path, reducing the contrast and light energy utilization.

Method used

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  • Adjustable Optical Attenuator
  • Adjustable Optical Attenuator
  • Adjustable Optical Attenuator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment is an example of a liquid crystal cell in a vertically applied field mode.

[0024] The liquid crystal cell is made of ITO glass without an orientation layer. Heat the blue phase liquid crystal above the clearing point (80°C) to fill the crystal, and keep the temperature for 10 minutes, then cool down at a rate of 0.1°C / min, and observe the phase of the liquid crystal under a polarizing microscope. The state changes until the liquid crystal phase is completely transformed into a blue phase state (68°C). Keep the temperature constant, and expose under the UV lamp of 5mW / cm2 for 6 minutes to make a stable blue phase liquid crystal cell at room temperature.

[0025] Adjust the position of the liquid crystal cell so that the direction of the optical axis of the liquid crystal after power-on is 45° to the polarization direction of the two polarized lights (adjust the angle between the liquid crystal cell and the horizontal plane and the direction of the incid...

Embodiment 2

[0027] This embodiment is an example of a liquid crystal cell in an in-plane field-added mode.

[0028] One side of the liquid crystal cell is flat plain glass, and the other side is glass with plug electrode structure. Heat the blue-phase liquid crystal to above the clearing point (80°C) to fill the crystal, and keep the temperature for 10 minutes, then lower the temperature at a rate of 0.1°C / min, observe the phase change of the liquid crystal under a polarizing microscope until the liquid crystal phase is completely transformed into Until the blue phase (68°C). Keep the temperature constant, and expose under the UV lamp of 5mW / cm2 for 6 minutes to make a stable blue phase liquid crystal cell at room temperature.

[0029] Adjust the position of the liquid crystal cell so that the direction of the optical axis of the liquid crystal after power-on is 45° to the polarization direction of the two polarized lights (adjust the angle between the liquid crystal cell and the horizon...

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Abstract

The invention provides an adjustable optical attenuator which comprises an adjustable light source, an optical fiber circulator, an optical fiber collimator, a birefringent crystal, a blue phase liquid crystal box, a reflecting prism and an optical intensity meter. Laser emitted by the adjustable light source becomes two beams of polarized light with polarization directions perpendicular to each other through the optical fiber circulator and the optical fiber collimator and then through the birefringent crystal, the polarized light passes through the blue phase liquid crystal box and is reflected by the reflecting prism and finally reaches the optical intensity meter through a loop, and the light attenuation amount is controlled on the basis of the corresponding matching relations between applied voltage on the blue phase liquid crystal box and intensity of transmitting light. The response time of the attenuator reaches the microsecond magnitude by means of the blue phase liquid crystal box, the magnitude order is accelerated by over two magnitude orders in comparison with nematic liquid crystals, and contrast and modulation quantity are improved. Besides, the adjustable optical attenuator is wide in working wave band range, voltage and energy consumption and cheap, a preparation method is simple, convenient and efficient, mass production can be achieved, and the optical attenuator is stable in performance and meets the practical requirements in the fields of optical communication, optical fiber sensing and integrated optics and the like.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to the design and manufacture of an adjustable optical attenuator. Background technique [0002] Liquid crystal materials have both the fluidity of liquids and the orderliness of crystals. Due to their excellent tuning characteristics of external fields (electric field, light field, sound field, temperature field, etc.), they play an important role in flat panel displays and adjustable photonic devices. application. As a unique liquid crystal phase, the blue phase has attracted extensive attention in recent years. The molecular group state of the blue phase liquid crystal is a liquid crystal phase in which a columnar structure with a double helix structure self-assembles to form a highly symmetrical three-dimensional cubic lattice. Due to this special symmetrical structure, it is optically isotropic when no electric field is applied, and has the advantages of no orientatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1335
Inventor 胡伟诸戈陆延青徐飞
Owner NANJING UNIV