The proliferation of photonics during the years created the imperative need for an index. This work of reference – International OptoIndex for Photonics – offers a comprehensive data source for companies and products in the sector. Who has the best solution to my problem? Where can I find a cost-effective product developments shortcut? This catalogue and website www.opto-index.de/ot will help to find the answers. Updated annually, the International OptoIndex 2017 is published in English.