Changfei Optical Fiber Cable Co., Ltd. (hereinafter referred to as "Changfei Company", stock code: 6869.HK) has introduced the CS980 fine-diameter coupled fiber, a high-performance optical fiber designed for use in the fabrication of 980nm pumping source pigtails and Erbium-doped Fiber Amplifier (EDFA) systems, either before or after the Erbium-doped Fiber (EDF) system. This fiber is also used in the production of 980/1550 Wavelength Division Multiplexing (WDM) couplers.
Compared to traditional coupled fibers, the CS980 fiber offers significant improvements. Its cladding diameter has been reduced from 125μm to 80μm, and the outer diameter has been reduced from 250μm to 165μm, achieving a reduction of over 30%. Additionally, it exhibits excellent bending performance and superior taper characteristics. During fusion taper verification, the fiber demonstrates low additional loss and high isolation, making it ideal for advanced optical applications.
The CS980 fine-diameter coupled fiber was developed with a focus on waveguide design and material innovation, aiming to reduce the fiber diameter while maintaining geometric stability, bending performance, and taper efficiency. It features excellent macro-bending performance and low taper attachment loss across its operating band, ensuring reliable performance in compact devices.
Key advantages of the CS980 fiber include:
1. The long-wing CS980 fiber has optimized geometric properties, with a cladding diameter controlled at 80±1μm. The core/package concentricity is typically below 0.2μm, which ensures better taper performance.
2. It offers excellent macro-bending performance, with losses ≤0.01dB at both 980nm and 1550nm when bent around a 20mm diameter circle, meeting the needs of miniaturized optical devices.
3. The fiber shows good compatibility with other optical fibers, with a welding loss of about 0.05dB when fused with a well-known foreign brand’s 980-20 fiber, and about 0.25dB when fused with Changfei G652D fiber.
In terms of taper performance, the CS980 fiber demonstrates stable optical power and minimal loss during the stretching process. Real-time measurements using a power detector equipped with a taper show that the loss remains consistently below 0.1dB throughout the experiment.
As one of the most fundamental passive components in WDM systems, tapers are widely used in wavelength division multiplexed optical communication systems due to their simplicity and cost-effectiveness. To further verify the performance of the CS980 fiber, tapers were made into WDM devices and tested. The spectral ratio and isolation data demonstrate the fiber's high quality and reliability.
In summary, the CS980 fine-diameter coupled fiber meets modern design and development requirements. It provides excellent geometric parameters, bending performance, splicing performance, and taper performance, making it suitable for a wide range of optical devices. Its performance exceeds that of similar foreign products.
Appendix:
Changfei Company offers a series of sub-models for WDM taper fibers. These fibers feature low taper loss (≤0.1dB), meeting the requirements of different working wavelengths and various types of devices. Whether for research, industrial applications, or commercial deployment, the CS980 fiber stands out as a versatile and high-quality solution in the field of optical communications.
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