Project acronym: CRITICAL
Project title: Component Requirements and Integrated Transceiver Investigation for Coherent Access Links
Project duration: 3 years 1 month from July 2011 to July 2014
Coordinator: Oclaro Technology Ltd
Scientific representative of the coordinator: Dr Mike Wale

Executive summary

The CRITICAL project aimed to develop coherent transceivers and system concepts for ultra-high bandwidth access systems. Partners for the 37 month project comprised Oclaro (Coordinator, UK), Deutsche Telekom AG (DE), NPL (UK), Coriant (DE), PMC Sierra (IL) and University College London (UK).
New indium phosphide (InP) based lasers were designed and developed using AlQ materials systems to enhance performance. Laser cavity and gratings were redesigned and devices manufactured, with the laser chips packaged and characterised. Excellent results were obtained.
Ambitious designs for the optical line terminal (OLT) and optical network unit (ONU) were addressed using functional building blocks for lasers, modulators and detectors. Combining all building blocks proved a challenge to complete within the project timescales. However, significant knowledge and understanding of the InP processing needed to realise the fully integrated design was gained, and a key output of the project.

Public project report (.docx download): CRITICAL