Reference

L. A. Everall et al, ‘Multiple-passband in-fiber Moiré resonators fabrication using nearfield
holography with a chirped phase mask,’ Proc. of the 11th Int. Conf. on Integrated
Optics and Optical Fiber Communications and 23rd European Conference on Optical
Communications, IOOC/ECOC ’97, Edinburgh, 22-25 September 1997, vol.2, pp.41-
44.

Description

The example demonstrates how to simulate the Moiré passband filter with a chirped
and apodized Bragg grating.

The grating has a user defined period chirp defined by the following:

p1=0.53082192
p2=0.5309589
chirp=-1.1e-3/Length
per1=p1+chirp*(x-Length/2)
per2=p2+chirp*(x-Length/2)
2*per1*per2/(per1+per2)

where the last line defines the chirp.

The user defined grating apodization is:

p1=0.53082192
p2=0.5309589
chirp=-1.1e-3/Length
per1=p1+chirp*(x-Length/2)
per2=p2+chirp*(x-Length/2)
2.0*cos(pi*x*(1/per1-1/per2)+pi/2)

where the last line defines the apodization.

The main result is the transmission spectrum of the grating.

Optical Grating - Wavelength Guide