Experimental reconstruction of a long-period grating from its core-to-core transmission spectrum.
We demonstrate, for the first time to our knowledge, reconstruction of the structure of a long-period grating from its measured core-to-core transmission spectrum intensity. The reconstruction is obtained by writing an auxiliary grating in cascade to the interrogated grating. Our reconstruction technique is based on using the Hilbert transform and a phase-retrieval algorithm. Using our method, we have reconstructed the structure of a uniform long-period grating with a 47% coupling efficiency.
Rosenthal
Amir
A
Department of Electrical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel. eeamir@tx.technion.ac.il
Horowitz
Moshe
M
Lange
Stephan
S
Shäffer
Christian
C