SEDI-ATI’s high directivity multimode couplers are ideal for optical metrology and sensing applications where the dynamic range of the sensor is a key parameter.
- GI50/125 or GI62.5/125 fibers,
- UV to IR wavelength range,
- High directivity,
- Mode insensitivity,
- Stable coupling ratio,
- High reliability,
- Low insertion loss,
- Custom configurations available.
Indeed, for these types of applications, high directivity is a fabulous advantage! Actually, high directivity is essential to minimize the light that can pass directly from the injection port of the 1×2 coupler (port 1: light source) to the detection port (port 2: detector).
In a round trip configuration (depending on the launch condition), the insertion loss from port 1 to port 2 is < 6.5 dB with a total reflection at the common port 3. This way a minimal mismatch between the input and the reflected signal is achieved!
Besides, the main other benefits of SEDI-ATI’s high directivity fiber-optic multimode couplers are mode insensitivity and achromaticity.
These couplers can be manufactured with any Graded Index fiber types such as GI50/125 μm with directivity as high as > 55 dB or GI62.5/125 μm with directivity as high as > 45 dB.
In addition, for high-power UV applications, we have developed the HDS series which can handle as much as 2 W @ 420 nm.
Finally, our high directivity fiber-optic multimode couplers are also available with different coupling ratios and fiber lengths upon request.