Difference between Single-mode And Multimode Couplers
Along with the optical fiber communication, optical fiber sensing optical network technology development, the optical fiber system matures, application fields expanding, and fiber optic system structure is complicated, make all kinds of passive functional device gradually developed, fiber optic coupler splitter is a kind among them.
With a fiber optic coupler, the light from an input fiber can appear at one or more outputs, Fiber optic coupler is an optical fiber device with one or more input fibers and one or several output fibers,Its input and output signals have a good separation effect. Light entering an input fiber can appear at one or more outputs and its power distribution potentially depending on the wavelength and polarization. So it is widely used in circuit applications. Fiber optic coupler can greatly increase the stability of computer when applied in digital communication and real-time computer control interface as a signal isolation device.
Fiber optic couplers or splitters are available in a range of styles and sizes to split or combine light with minimal loss. All couplers are manufactured using a proprietary process that produces reliable, low-cost devices. They are rugged and impervious to common high operating temperatures. Couplers can be fabricated with custom fiber lengths and/or with terminations of any type.
If all involved fibers of the fiber coupler are single-mode ,there are certain physical restrictions on the performance of the coupler. for example, it is not possible to combine two inputs of the same optical frequency into one single-polarization output without significant excess losses. However, a fiber optic coupler which can combine two inputs at different wavelengths into one output,which are commonly seen in fiber amplifiers to combine the signal input and the pump wave.
Single Window FBT Coupler are designed for power splitting and tapping in telecommunication equipment, CATV network, and test equiptment. Our single mode optical couplers work at either 1310nm or 1490nm or 1550nm. They are fabricated using single mode fibers. Single Window FBT Coupler have operation bandwidth of 40nm around its central wavelength. Such as 1×2 fiber coupler is one of single-mode fiber couplers.
Don’t forget, fiber couplers not only have single-mode couplers,but also have multimode couplers.Multimode Coupler is fabricated from graded index fibers with core diameters of 50um or 62.5um. Fiber optic multimode couplers are applied in short distance communications at 1310nm or 850nm. Multimode couplers are manufactured using a technique or fusion technique. They are available for all common multimode fibers with core diameters from 50 μm to 1500 μm.
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