The FOSC-1-15-33-C-1-S-1 from AFW Technologies is a Fiber Optic Coupler with Wavelength 1550 nm, Directivity 55 dB, Insertion Loss 6 dB, Polarization Dependent Loss 0.15 dB, Operating Temperature -5 to 70 Degree C. More details for FOSC-1-15-33-C-1-S-1 can be seen below.