Re: Optical isolator question

When doing FBG measurements using an OSA and  BBS. You need the isolator to
prevent the DUT reflexion to alter the source spectrum and scrap your
reference trace.

This is one case you need it.

What is your application?

Eric Girard


"Jmm39531" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> I have seen a fiber optics part called an "isolator", that can be
integrated
> inside a laser diode package or can be a fiber passive in-line device.
The
> device is said to allow light to pass in one direction, and block it from
> passing the other direction so reflections can't bounce back into the LD
> resulting in a noisier output.
> My question is:  How do I know if I need to use an isolator?
> In what cases are they needed or required?  Do optical reflections damage
the
> laser diode in any way or shorten its life-span?
> Thanks for any information on this.