Changfei Optical Fiber Cable Co., Ltd. (hereinafter referred to as "Changfei Company", stock code: 6869.HK) introduced CS980 fine-diameter coupled fiber. CS980 fine-coupling fiber is mainly used in the fabrication of 980nm pumping source pigtails and Erbium-doped Fiber Amplifier (EDFA) system in front of or behind the Erbium-doped Fiber (EDF) system. Production of 980/1550 Wavelength Division Multiplexing (WDM) coupler. Compared with the original coupled fiber, in addition to excellent bending performance and excellent taper performance, the fiber cladding diameter is reduced from 125μm to 80μm, the outer diameter is reduced from 250μm to 165μm, and the outer diameter is refined by more than 30%. And in the fusion taper verification, this fiber exhibits the advantages of low taper additional loss and high isolation.
Second, the basic performance of CS980 fine-diameter coupled fiber Â
Changfei Company developed the CS980 fine-diameter coupled fiber from the aspects of waveguide design and new material design, focusing on fiber diameter reduction and geometric stability, bending performance and taper performance. The fiber has excellent macrobend performance and low taper attachment loss in the operating band.
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Changfei CS980 fine-diameter coupled fiber has the following advantages: Â
(1) The long-wing CS980 fine-diameter coupled fiber optimizes the geometrical characteristics, and the cladding diameter is controlled at 80±1μm. At the same time, in order to achieve a better taper effect, the fiber core/package concentricity is typically below 0.2 μm.
(2) Changfei CS980 fine-diameter coupled fiber has excellent macro-bending performance, φ20mm×1 circle @980nm loss≤0.01dB, φ20mm×1 circle @1550nm loss≤0.01dB, fully satisfying the use of miniaturized devices.
(3) Changfei CS980 fine-diameter coupled fiber has high matching with other optical fibers, and the welding loss of 980-20 fiber with a well-known foreign brand is about 0.05dB, and the welding loss of Changfei G652D fiber is about 0.25dB.
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Third, CS980 fine-diameter coupled fiber taper performance Â
Optical fiber loss in the fiber during the melt drawing process, material defects and waveguide structure changes. Therefore, in the single-fiber taper experiment, the optical power loss and the optical power stability data can directly evaluate whether the fiber is suitable for making a fusion fiber device. The optical power and loss in the fiber during stretching can be measured in real time by a power detector equipped with a taper.
The experiment used a 980 nm single-mode pumping source and a 1550 nm single-mode pumping source with a taper speed of 140 μm/s, a H2 flow rate of 150 ml/min, an O2 flow rate of 7 ml/min, and a coupling period of 0 (ie, a single fiber taper). Fig. 1 is a splitting-time curve obtained by tapping a long-wing CS980 fine-diameter coupled fiber, and records the change of the splitting ratio with the stretching time in the whole process from the start of stretching to the preset splitting ratio. During the whole experiment, the loss characteristics of Changfei CS980 fine-coupling fiber are small, the curve is gentle, and the loss is always lower than 0.1dB.
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As WDM light One of the most basic elements passive devices, has been widely used in a wavelength division multiplexed optical fiber communication system. Because of its simple operation and low price, the taper has become a common production method for WDM. In order to further verify the performance of Changfei CS980 fine-coupling fiber, the taper is made into WDM and tested. The spectral ratio and isolation data are shown in the following table:
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In summary, Changfei CS980 fine-diameter coupled fiber meets the requirements of development and design, has good geometrical index, bending performance, welding performance and taper performance, meets the requirements of optical fiber for taper devices, and its performance exceeds that of similar foreign products.
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Changfei Company has the following series of sub-models for WDM taper fiber. These fibers have low taper loss (≤0.1dB), which can meet the requirements of different working wavelengths and different types of devices.
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