Failure rates of optical transceivers

Hi,

We’ve been using for a long time transceivers (40G MPO) from an aftermarket vendor (fs.com) for our CISCO 3132Q-X usually they work well, but lately we have been seeing more failures than usual (suddenly a perfectly working transceiver starts having plenty of CRC errors that only go away once we replace the transceiver). Might be also related to the size of our deployment as, we have a several hundred optical transceivers (More units = more failures).

But lately we are wondering if it would make more sense to use original transceivers instead of aftermarket.

What’s your experience with aftermarket vs original optical transceivers? Reliability, MTBF, etc?

Thanks!