The F-CPL-F22151 from MKS | Newport is a Fiber Optic Coupler with Wavelength 1550 nm, Insertion Loss 0.63 - 11 dB, Return Loss 55 dB, Polarization Dependent Loss 0.1 dB, Operating Temperature -40 to 85 Degree C. More details for F-CPL-F22151 can be seen below.