Optical transmitter receiver, high-speed LVDS connections, Optical Switch

 TT Electronics - Optek Technology OPB981L51Z in Bulk. OPB981 Series 35 V 850 nm 40 mA Transmissive Photologic Slotted Optical Switch.

https://www.futureelectronics.com/p/semiconductors--optoelectronics--optical-sensors-switches/opb981l51z-tt-electronics-optek-technology-8145120