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Optical fiber

An optical fiber, optical waveguide technology, applied in the direction of cladding optical fiber, optical waveguide light guide, etc., can solve the problems of large insertion loss, increased cost, and poor control of refractive index distribution, and achieve large unit length dispersion compensation and flexible design. Effect

Inactive Publication Date: 2007-11-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0007] Although the dispersion compensating fiber (DCF) compensation method has the above advantages, it should be noted that the compensation amount per unit length of DCF is low, and the dispersion compensation value of DCF per kilometer is generally on the order of hundreds of ps / nm
In addition, the insertion loss of DCF is relatively large. After dispersion compensation, an optical amplifier is required to compensate the loss, which increases the cost.
In addition, compared with standard optical fibers, DCF has a thinner core diameter and a larger refractive index difference, so the refractive index distribution is not easy to control, and the production is more difficult.

Method used

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Embodiment 1

[0048] Refer to the photonic crystal fiber structure of solid light guide, which is composed of quartz and air holes in the cladding, which can be regarded as the air holes surrounding the quartz in the center. In view of this, the present invention refers to such a structure as a light guide unit, the solid part in the center is called the central optical waveguide region, and the peripheral air hole and the area near it are called the external field region. As shown in Fig. 4, the central optical waveguide area is inside the middle ring, and the area with pores distributed outside is the external field area.

[0049] See Figure 3. This embodiment includes a first light guide unit and a second light guide unit. The second light guide unit is distributed in the outer field area of ​​the first light guide unit and is surrounded by the air holes of the first light guide unit. The first and second light guide unit structures are arranged in accordance with the photonic crystal fiber ...

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Abstract

Optical fiber mainly involves optical fiber communications technology. The invention includes first - and second-beam unit, the second unit distributes in the first's outside field, and was surrounded by the first unit stomata. The beneficial effect of invention is having a great unit length of dispersion compensation, and flexible design of the slope of the dispersion compensation. PCF clad special structure can be changed by the designers cladding air holes parameters of the structure to have the flexibility to change the refractive index of optical fiber cross-sectional distribution, designed to have different dispersion nature fiber.

Description

Technical field [0001] The present invention relates to optical fiber communication technology. Background technique [0002] In optical fiber communication, there are different degrees of dispersion problems. Dispersion refers to the phenomenon of light pulse broadening caused by the group delay difference of light waves of different frequencies or different modes in the optical fiber. Since the optical fiber digital communication transmits a series of optical pulse codes, when the optical pulse is transmitted along the optical fiber, the dispersion causes the optical signal pulse to be broadened, causing a part of the adjacent pulses to overlap each other, so that the two adjacent pulses cannot be correctly identified by the receiving device This causes system errors and affects communication quality. In order to limit the inter-symbol interference, the pulse spread caused by dispersion must be limited within a certain range. When the spread of the optical signal pulse caused b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02
Inventor 姜海明王文丹谢康王亚非
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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