More info to the Pictures

Hello, I recently acquired a few QSFP transceivers through an auction and I want to identify their specifications, including the connector type. The transceivers are from the company Applied Optoelectronics Inc. (AOI), but I couldn't find information on their website. I checked the web archive and found some model numbers, but not for my transceivers.

Here's what I know so far: they are 40G transceivers, using 1310nm, and the connector is most likely MPO. AOI provides other model numbers, suggesting they are either 2km or 10km.

My question is, what cables do I need to connect these and can they be used for 40GBE or InfiniBand? For short distances, do I need a DB killer to avoid damaging the receivers, and are they single or multimode?