It's an old document from May 2015 but it still gives a good overview:
"Photonics Integrated Circuits Value Chain
This document is divided in two parts: (1) Classification of companies along the PIC value chain, and (2) Short description of each company. The purpose is to have a better understanding of the actors along the PIC value chain. Please send any corrections, improvements, suggestions to carlos.lee@epic-assoc.com "
The list can be found here: https://www.google.co.il/url?sa=t&rct=j&q=&esrc=s&source=web&cd=39&ved=0ahUKEwiV7_jZrYHNAhXGHxoKHf7lCcU4HhAWCFAwCA&url=http%3A%2F%2Fwww.epic-assoc.com%2Fwp-content%2Fuploads%2F2015%2F02%2FPIC-Value-Chain-Companies-version-3-September-2015.docx&usg=AFQjCNEcTT_262_Sx74tZdfErwD-6loZKQ&sig2=0etB6YJEbq9FcHcJKvd7fw&cad=rja