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This section provides an overview for polarization controllers as well as their applications and principles. Also, please take a look at the list of 7 polarization controllers manufacturers and their company rankings. Here are the top-ranked polarization controllers companies as of January, 2026: 1.Beijing Rofea Optoelectronics Co., Ltd., 2.FOCC FIBER CO.,LIMITED, 3.Box Optronics Technology.
Table of Contents
Polarization Controllers are devices that arbitrarily control the polarization state of light propagating within an optical fiber.
In the fields of optical fiber communication and optical measurement, the polarization state—the direction of light vibration—has a significant impact on system performance. In typical single-mode fibers, external factors such as temperature changes, vibration, and fiber bending cause the polarization state to fluctuate randomly. As a result, it becomes necessary to correct and adjust the polarization state of light propagating within the optical fiber to a desired state.
Polarization Controllers generate arbitrary polarization states, such as linearly polarized or circularly polarized light, by rotating the polarization or delaying the phase using birefringence. Various types are available to suit different applications, ranging from simple manually adjustable paddle-type controllers to models that perform high-speed, automatic tracking control via electrical signals. Through these functions, Polarization Controllers play a crucial role in supporting advanced optical technology infrastructure.
Polarization Controllers are used in the following applications
Polarization Controllers are indispensable in long-distance, high-capacity transmission systems utilizing digital coherent communication technology. In polarization multiplexing transmission, which uses light polarization to multiplex information, the polarization state must be accurately separated and controlled at the receiver. In addition, Polarization Controllers are used to compensate for polarization mode dispersion that degrades high- speed communication quality and to control photon states in quantum cryptography, contributing to the advancement of communication infrastructure.
In precision measurements using optical fiber sensors and interferometers, polarization fluctuations can contribute to measurement errors. Therefore, Polarization Controllers are employed to stabilize polarization states and maintain measurement accuracy. In the medical field, they are introduced in optical coherence tomography (OCT) systems to control the polarization state of light reflected from biological tissues, enabling the acquisition of clearer cross-sectional images.
Optical components such as optical amplifiers and optical switches exhibit a characteristic known as polarization-dependent loss (PDL). During product development and quality control processes, various polarization states are intentionally input to verify proper device operation and to evaluate loss characteristics. Polarization Controllers are widely used in evaluation tests that require systematic variation of polarization states.
*Including some distributors, etc.
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Best In Class Fiber Optic Components/Modules/Systems, Custom-Engineered, Cost-Effective Solutions with Optional U.S. Manufacturing. We make best-in-class optic/electro-optic products based on over 25 years of intensive R&D and rigorous engineering. We strive to provide premium product solutions with unmatched value. Our product offerings are vertical, from components, modules, and turn-key systems for sensing, security, data storage, communication, instrumentation, medical, environmental, undersea, defense, and space applications. We deliver high quality with a warranty against defects in materials and workmanship. We are an ISO-certified and ITAR-registered U.S. corporation. Agiltron® is a registered trademark of Optowares Corporation.
EOSPACE, founded in 1997, is a manufacturer of electro-optical integrated circuits (ICs) and components located in Redmond, Washington. They provide modulators, polarization maintaining splitters, polarization controllers, as well as switches, switch matrices, and optical modules. These products enable efficient transmission, routing, and manipulation of optical signals. EOSPACE products use proprietary lithium niobate integrated optics devices for low insertion loss and broad bandwidth and are utilized in various applications such as optical telecommunication and photonic systems.
Newport is a division of MKS Instruments, Inc. that was incorporated in 1961 and headquartered in Andover, Massachusetts. The company is a manufacturing company that serves the specialty industrial, advanced electronics, and semiconductor industries. The company markets its products through Spectra-Physics, MKS Instruments, Richardson Grating, and other brands. Their product categories include motion, optomechanics, optics, and vacuum instruments. Product categories include lasers, MKS vacuum & gas solutions, laser diode controls, and tables & isolation systems.
FOCC Fiber Co. Limited, established in 2004 and headquartered in Shenzhen, China, is a manufacturer of fiber optical connectors and related assembly technology. The company's products include fiber cable assemblies, fiber optic pigtails, and fiber optic patch cords. It also provides standard fiber optic adapters, MPO adapters, and footprint fiber optic adapters. These products are used by data centers, ICT equipment manufacturers, and government departments. The company offers OEM and ODM services as well as custom production of components for approved clients.
Box Optronics Technology Co., Ltd., established in 2003 and headquartered in Shenzhen, China, is a manufacturer and supplier of fiber optic solutions. The company’s comprehensive product range includes fiber optic modules such as SFP, SFP+, QSFP, XFP, and customized modules. Additionally, it offers fiber-coupled lasers at various wavelengths, and tailored lasers. The company also provides laser components, including laser diodes and laser drivers. With a broad reach spanning industries like telecom, industrial, medical, and defense, the company offers design, engineering, manufacturing, testing, and technical support services. It also holds ISO 9001:2015 certification, ensuring international standards in quality management.
Ranking as of January 2026
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Beijing Rofea Optoelectronics Co., Ltd. |
16.7%
|
| 2 | FOCC FIBER CO.,LIMITED |
16.7%
|
| 3 | Box Optronics Technology |
16.7%
|
| 4 | EOSPACE |
16.7%
|
| 5 | Thorlabs Inc. |
16.7%
|
| 6 | Newport Corporation |
16.7%
|
Derivation Method
The ranking is calculated based on the click share within the polarization controllers page as of January 2026. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
3 | 50.0% |
|
China
|
2 | 33.3% |
| USA | 1 | 16.7% |
