PM device application solution

As the application of fiber optic amplifier more and more widely, in some special applications, the need to maintain the polarization of light, so polarization-maintaining fiber amplifier came into being. Polarization fiber amplifier can be used in coherent optical communication, optical fiber sensing, optical pulse amplification and other fields; in the laser ranging, B-OTDR, interference measurement has a unique advantage.

The main application principle of polarization maintaining fiber amplifier is shown in the following figure.

The polarization maintaining fiber structure device includes input coupler, isolator, WDM, erbium fiber, output coupler, and pump laser Of the pigtail are polarized pigtail. This structure is fully biased structure, is the optical signal in the transmission process, always maintain the consistency of the polarization.

Fukumitsu production of polarized fiber optic device products, with wide bandwidth, high return loss, high isolation, high extinction ratio, environmental stability and so on. Typical wavelengths include 980nm, 1064nm, 1310nm, 1480nm 1550nm, etc., can also be provided according to customer requirements C-Band, L-Band and other broadband devices. These devices are widely used in polarization maintaining fiber amplifier, polarization maintaining fiber laser, polarization maintaining fiber sensing system, high-speed communication system and experimental test equipment and equipment.

The polarization-maintaining fiber amplifier amplifies the narrow width of the single-frequency laser, with grating, photoelectric detection devices, etc., can be applied to the distributed optical fiber sensor, ultra-long distance and ultra-wide area to monitor. Such as the use of fiber optic hydrophone array. The US Department of Defense has been very active in the study of submarine hydrophone sonar arrays, fiber bottom arrays, and towed arrays using TDM and WDM technology. These sensor arrays can also be used extensively in oil exploration and earthquakes.
B-OTDR (Chinese name "Brillouin scattered light time domain reflectometer") break through the traditional conventional OTDR attenuation test method, can fully monitor the submarine cable manufacturing, loading and unloading, construction, operation and maintenance of any section of the fiber stress and strain , Which intuitively reflects the fiber in the process of the force situation, which improve the submarine cable manufacturing process, construction programs and early detection of hidden dangers, has a very important significance. The polarization maintaining fiber amplifier can also be used in B-OTDR.

PM fiber optic coupler typical application

The two beams, which are used to divide the polarized light into the same polarization state as the input light, are one of the key devices of various interferometric fiber optic sensors, and are widely used in the fields of optical fiber sensing and fiber optic gyroscope. Fukumitsu company uses the crystal diaphragm principle of the polarization-proof principle of the production of polarization-maintaining coupler, relative to the use of matching-type polarization-maintaining fiber through the melt-pull cone made by the way of the polarization-maintaining coupler, with additional low loss, extinction ratio and wide wavelength characteristics The The most important feature is the stable transmission of two orthogonal linearly polarized light, and can maintain their own polarization state unchanged, so that polarization-maintaining fiber coupler is to achieve polarization-coupled, spectral and multiple of the key components, become High-precision high-performance fiber optic gyroscope one of the core devices.

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