Like almost every secondary weapons, you can obtain the Ocucor from several ways. Among all of them, the first option is to buy it in the Market Console or through your Arsenal for 175 Platinum. If you choose this option you will also get an extra weapons slot as well as an Orokin Catalyst already installed.
The second way to obtain the Ocucor is completing its Research in the Corpus Lab of your Dojo. Once the research finishes you can buy the Blueprint to craft it later in the Foundry of your ship.