A National Optical Communication Brand Born from the Landscapes of Guilin

In 2001, in the scenic city of Guilin, Guangxi, GLSUN (Guilin Guanglong Science and Technology Group Co., Ltd.) was officially established. From a technology company focused on semiconductor laser chips and optical passive devices, GLSUN has grown over 25 years into a national high-tech enterprise and a key Torch Program enterprise. It integrates optical chip R&D, optical passive device manufacturing, optical modules, and system integration.

More Than 25 Years of Optical Expertise

Today, GLSUN possesses a complete semiconductor process platform—from chip simulation design and MOCVD epitaxial growth to packaging and testing. Its products are widely used in data center interconnects, 5G/optical communications, fiber sensing, LiDAR, and other fields, serving global optical network construction. “Self-developed and self-manufactured, independently controllable” remains the core brand DNA of GLSUN.

Core Product Positioning: GLSUN focuses on high-performance, cost-effective, and highly reliable optical communication core devices and system solutions, with unique competitive advantages especially in Optical Isolators and Optical Switches.

China’s Leading Optical Isolator Brand — The “One-Way Street” Protecting Optical Signals

GLSUN Optical Isolators utilize high-performance Faraday rotator design, delivering high isolation, low insertion loss, wide wavelength range, and high power handling. The portfolio includes free space isolators, inline isolators, polarization-maintaining isolators, and high-power series, widely used in laser protection, fiber amplifiers, test & measurement, and more.

As a leading enterprise in China’s optical isolator field, GLSUN has achieved large-scale stable supply through vertically integrated chip and device manufacturing capabilities. Its market share and technical influence have long ranked No.1 in China. Whether in telecom backbone networks or emerging laser applications, GLSUN isolators are the preferred choice of countless optical system engineers for their “zero feedback” high reliability.

Key Advantages

✔ High isolation performance
✔ Low insertion loss
✔ Excellent temperature stability
✔ High-volume manufacturing capability
✔ Strict reliability testing
✔ Stable long-term supply capability

With mature production lines and strong process control, GLSUN supports customers with both standard and customized isolator solutions for diverse application scenarios.

Optical Switches: Self-Developed & Self-Manufactured Since 2001 — 25 Years of Brand Legacy and Industry-Leading Capacity

Optical Switches are GLSUN’s core strategic product. Since the company’s founding in 2001, GLSUN has consistently adhered to independent R&D and in-house production. The company has developed multiple technology routes including mechanical, MEMS, magneto-optical, nanosecond-level, and polarization-maintaining switches, covering full series specifications such as 1xN, MxN, 2x2, etc.

Why Choose GLSUN Optical Switches?

• Long Brand History: 25 years of dedicated accumulation, backed by patented technologies and mature, stable product iterations.
• Self-Developed & Self-Manufactured: Full supply chain control from chips to modules ensures short lead times and high quality consistency.
• Industry-Leading Capacity: Large-scale production lines support high-volume, high-density rack-mount optical switch deliveries to meet massive deployment needs in AI data center clusters, optical line protection (OLP), fiber monitoring, etc.
• Superior Performance: Low insertion loss, high repeatability, millisecond or nanosecond switching speeds, and ultra-long lifetime.

GLSUN optical switches are widely deployed in fiber network protection, automated test systems, data center optical interconnects (OCS), optical sensing, and other fields, helping customers achieve flexible, intelligent, and highly reliable optical path management.

GLSUN Brand Promise: Connecting with Light, Empowering the Future

For 25 years, GLSUN has upheld the mission of “Connecting the World with Light, Empowering the Future with Chips”. Driven by technological innovation and customer value, and supported by strong vertical integration, rigorous quality systems, and continuous R&D investment, GLSUN has become a trusted strategic partner for leading optical communication equipment vendors worldwide.

Choosing GLSUN means choosing:

• 25 years of brand heritage and technical expertise
• China’s leading optical isolators and full-range self-developed optical switches
• Highly stable, large-capacity, and responsive supply chain assurance
• Innovative solutions tailored for AI data centers, 5G/6G, and optical sensing

With over 25 years of experience, GLSUN is not only manufacturing optical products — it is helping build the next generation of optical connectivity.