48CH 100GHz PM AAWG DWDM Module C-Band Mux / Demux Low Insertion Loss High Isolation

The Polarization Beam Combiner & Splitter (PBC/S) is a high-performance passive device based on polarization-maintaining fiber technology, used for efficient beam combining or splitting of orthogonally polarized optical signals. This product typically operates in the commonly used wavelength ranges of 980 nm, 1064 nm, 1310 nm, 1480 nm, 1550 nm, and 1260–1620 nm, featuring low insertion loss, high extinction ratio, and high directionality. It is suitable for fiber optic systems with stringent requirements for polarization characteristics and power stability. In PBC mode, it can combine two orthogonally polarized input beams into a single output to increase output power or achieve power combining; in PBS mode, it can separate a single input beam into two outputs according to its polarization state. The device uses a compact metal package and a polarization-maintaining Panda fiber pigtail, facilitating integration into various modules and systems while maintaining excellent polarization stability and repeatability during long-term operation.

At the application level, PBC/S is widely used in fiber lasers, fiber optic sensing, optical communication, and precision testing. For high-power fiber lasers, it can combine two or more orthogonally polarized light sources to achieve higher output power or optimize power distribution. In fiber optic sensing systems, the polarization beam splitting function can be used to construct high-sensitivity interference structures for precise measurement of physical quantities such as stress, temperature, or refractive index. In optical communication and DWDM systems, PBC/S can be used in conjunction with polarization-maintaining couplers, isolators, WDM modules, and other devices for polarization management, signal monitoring, and polarization multiplexing/demultiplexing. In research and laboratory platforms, it is also frequently used to build polarization-dependent experimental optical paths for polarization state control, quantum optics experiments, and other tasks, making it a core component in many polarization-sensitive systems.

This product is designed with three key characteristics in mind: low loss, high polarization performance, and high reliability. First, in both combined and split-beam modes, the main channel insertion loss is strictly controlled to a low level, typically reaching 0.35–0.7 dB, which helps reduce system power budget pressure. Second, the high extinction ratio in split-beam mode effectively distinguishes between two orthogonal polarization states, ensuring accurate polarization selection. Simultaneously, the device exhibits high directivity and return loss, suppressing back reflections and crosstalk, thus improving the system signal-to-noise ratio. Furthermore, the PBC/S utilizes high-quality polarization-maintaining Panda fiber and an optimized optical path structure, supporting high power handling capabilities. Pigtail length, sheath diameter, and connector type can all be flexibly customized to meet customer needs. The product has passed rigorous temperature cycling, mechanical tensile, and environmental reliability tests, making it suitable for long-term stable operation in complex environments.

From a system integration perspective, the PBC/S can be deployed in different locations within the system as either a primary functional device or an auxiliary conditioning device. For example, in a fiber laser, a polarization combiner (PBC) can be used to combine multiple pump or signal beams before entering the amplification stage to optimize overall efficiency. In optical network monitoring systems, the polarization-maintaining circulator (PBS) function can separate optical signals with specific polarizations and send them to the monitoring channel for power detection or status analysis. In coherent receivers or polarization multiplexing systems, PBCs/S can be used with polarization-maintaining circulators, polarization-maintaining couplers, and PM-DWDM modules to build complete polarization diversity and management solutions. Engineers can select appropriate wavelengths, packaging forms, and connection methods according to different system requirements for power, polarization, size, and interfaces, directly integrating the device into the chassis, module, or experimental optical path for plug-and-play functionality.

Compared to ordinary single-mode combiners or splitters, the advantages of PBCs/S lie in their precise control over polarization states and highly predictable optical behavior. Its internal optical structure is specifically designed for polarization-maintaining fibers. The port fiber and connector keying can be aligned with the slow axis, allowing users to maintain a consistent polarization direction during splicing and installation, avoiding system performance fluctuations caused by polarization drift. Because the device has undergone system optimization in terms of insertion loss, extinction ratio, return loss, and power handling, it ensures polarization performance without introducing excessive additional losses to the overall link. Furthermore, its standard small package makes the PBC/S ideal for high-density integrated modules or compact devices, reducing system size and facilitating cabling and maintenance. With customizable wavelengths, pigtails, connectors, and environmental ratings, the PBC/S helps customers achieve a better balance between cost, performance, and reliability.

In summary, the Polarization Beam Combiner & Splitter is a key passive device for polarization-sensitive fiber optic systems, combining low insertion loss, high extinction ratio, high directionality, and high reliability, providing stable and controllable polarization management capabilities in both combining and splitting modes. Whether in fiber laser systems seeking high power output, fiber optic sensing platforms requiring high-precision measurements, or optical communication and coherent receiving systems emphasizing signal quality and polarization control, the PBC/S provides a solid optical foundation for overall system design. Through appropriate component selection and system integration, users can significantly improve system power utilization, measurement accuracy, and long-term operational stability, giving their products a stronger competitive edge in a highly competitive market.