Difficult question.  In general, planar waveguides typically utilize higher index contrast leading to more options for creating sensors.  Fibers have extremely low contrast and it is sometimes more difficult to build sensors into them.  Fiber sensors do have a great advantage of the ability to be placed very far from the driving electronics.

HI Raymond , 

                    Thanks , You are correct . But  if both of the structures have the same index contrast then ?  In terms of coupling of light which one is better ( planar waveguides or microstructured one ) 

I really appreciate you help 

Regards

Sreenesh

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I think planar because that geometry will give you more options in fabrication to couple light in and out.

Hi Raymond , 

                        I don't agree with this part ,,as we can alter the shape , size , number of air hole arrangement , number of cores and its arrangement in the cladding in   microstructured fibers so that coupling of light can be controlled .

I know that planar has got more  advantage in sensing than microstructured , but not in terms of geometry .... What you say ??

Regards