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In-Line Fiber Partial Reflector
10:90 Partial Reflector with FC/APC Connectors
67:33 Partial Reflector with FC/PC Connectors
Thorlabs’ In-Line Partial Reflectors are designed to partially reflect the input light; a portion is reflected back towards the input end while another fraction is transmitted to the output. This is achieved by splitting the input light and using an
These partial reflectors have a 1450 nm - 1650 nm single mode wavelength range with either a 67:33 or 10:90 reflection ratio. The reflection ratio
Each partial reflector includes two protective caps that shield the ferrule ends from dust and other hazards. Additional CAPF Plastic Fiber Caps and CAPFM Metal Threaded Fiber Caps for FC/PC- and FC/APC-terminated ends are also sold separately. Mating sleeves are available to couple patch cables together and serve to minimize back reflections and ensure proper alignment of the cores of each connected fiber.
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Figure 1: All-Fiber Beamsplitter Setup
Fiber partial reflectors are useful in creating a variety of devices such as beamsplitters, laser cavities, and interferometers. These fibers reflect a fraction of the light back down the fiber, transmitting the remainder through the output fiber connector.
This property is especially useful for creating an all-fiber beamsplitter; the user can split a light source without requiring free space coupling using a beamsplitter cube. Figure 1 shows this simple setup made up of a fiber circulator and a 67:33 fiber partial reflector. Light is input into Port 1 of the circulator, with the partial reflector coupled to Port 2. The input light is coupled from Port 1 to Port 2; roughly 33% of the light is transmitted through the fiber output, and the remainder is reflected back towards the input and directed towards Port 3 by the circulator.