I think you made the right choice. You've come up with a great sensor topology. FBGs are good, but there's so much to them that is just infuriating. I ended up

I think you made the right choice. You've come up with a great sensor topology. FBGs are good, but there's so much to them that is just infuriating. I ended up late in my optics work spending most of my time finding ways to avoid them.