The PhD is a doctoral degree, specifically called a "doctor of philosophy" degree. This is misleading because PhD holders are not necessarily philosophers (unless they earned their degree in philosophy!). That said, PhD recipients are able to engage in thought experiments, reason about problems, and solve problems in sophisticated ways.
Learning quality skills and ideas on optical science would be advantageous and even interesting for professionals in the field. This has been emphasized since the introduction of a PhD degree in Optics and Photonics. It is a worldwide course that is offered by research institutions, and it exposes students to the ranging career lines.
Portugal is one of the warmest European countries. University programs are very affordable. In fact Portugal has one of the lowest living costs for students. Enjoy the the great beaches in Algarve or the old wings of history in the capital city of Lisbon.
Braga is one of the oldest cities in the northwest Portugal and has the oldest catholic archdiocese in the country. Being a large city in the municipality, two main universities have their headquarters here. These are Minho University and the Universidade Catolica Portuguesa.
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