Are there differing qualities of optical cable?

I installed a new glass fiber optical cable.  It was a definite improvement over my previous Monster optical.
Today I just got a new DH Labs Silver Sonic coax cable.
Again, a definite improvement over my previous Cardas coax AND definitely better than the new optical.
So, double improvement!
Thanks for all the suggestions.

Question:  Does coax cable require burn in?
It sounds great right now.

Awsome that you had a significant improvement! I suspect that some burn-in will help.  I don't think it will be as drastic as an analog cable.

And there are people that say cables don’t make a difference!

Thanks Auxinput for your awesome suggestion.
i can’t believe the difference.
The cable removed distortion I had in a very, very loud Mahler symphony (#8) and significantly improved sound staging.