The length L of the coupling region determines the coupling ratio of these two fibers. Schematic diagram of regional structure and optical coupling distribution of fused taper(Red is fiber core, Purple is cladding, Green and Blue are light). The area which these two optical fibers winding and fusion stretching is called Coupling Region, whose structure is shown in Figure 1:įigure 1. The fused taper coupler is composed of two parallel optical fibers The optical fibers are wound together in the high temperature environment, the optical fibers are gradually melted and stretched at the same time, so that the fiber cores of two optical fibers are gradually close to a certain distance. Wide working wavelength bandwidth, low additional loss, high stability and reliability.ģ).Made by melting taper technology, it provides a variety of wavelength options in the wavelength range of 405 nm-2050 nm. A beam of light can be divided into two or more beams according to a certain power ratio.Ģ). With the rapid development of optical fiber technology, optical fiber coupler has been gradually developed1 × 2 / 2 × 2 / 1 × 3 or 3 × 3 and other coupling types, as well as a variety of different coupling ratio applications.ġ). In the early stage, it was mostly used to take out a certain power in the transmission trunk road for monitoring. If there is pulse application, please be sure to inform us of pulse energy and peak power.įused biconical fiber coupler (FBT coupler) is a kind of optical passive device which can couple the optical signal in the coupling region of special structure and redistribute it.For >10W high power applications, we will use heat sink package, contact DK Photonics for details.The default connector key is aligned to slow axis. Power transmits through the connector less than 2W. For devices with connectors, IL will be 0.3dB higher, RL will be 5dB lower and ER will be 2dB lower.All parameters are tested at room temperature. Above specifications are for device without connector, and the PM fused coupler is both axis working, no axis can be blocked default test extinction ratio is on the slow axis.Requests for custom fiber pigtails, different wavelengths, tap Ratio and handling power of operation or other specific needs will be readily addressed. If you do not see a standard PM Fused Coupler that meets your needs, we welcome the opportunity to review your desired specification and quote a custom PM fused Coupler. 1x3 monolithic fused PM fiber standard splitter is widely used for optical sensors and optical gyro. It features low excess loss, small size and high polarization extinction ratio. The coupling ratio could be selected according to customer’s request. DK Photonics uses unique fusing technique and polarization maintaining fiber to build the 780nm 1x3 monolithic fused PM fiber standard splitter.
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