Scheduled System Maintenance:
On Monday, April 27th, IEEE Xplore will undergo scheduled maintenance from 1:00 PM - 3:00 PM ET (17:00 - 19:00 UTC). No interruption in service is anticipated.
By Topic

Fiber wavelet filters [and planar waveguide couplers for full-wavelength demultiplexers]

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Cincotti, G. ; Electron. Dept., Rome Univ., Italy

The passive optical networks proposed by Marhic and Siegman to evaluate the discrete Fourier transform (DFT) of a linear array or a pixellated image (parallel input) are redesigned for the discrete wavelet transform or the wavelet packet (WP) decomposition. Using only asymmetric optical couplers, with a suitable power coupling ratio, it is shown that it is possible to optically implement Mallat's pyramidal decomposition scheme with a compactly supported wavelet basis function. The case of a serial input has a larger number of potential applications to optical communications systems or optical computing, and simple passive optical networks are presented that evaluate the DFT or the wavelet transform of a stream of optical digits, by using only Mach-Zehnder interferometers with output asymmetric couplers. In particular, an all-optical implementation of the WP-division demultiplexer for a waveform coded transmission system is given. The proposed networks are full-wavelength demultiplexers, as they split the spectrum of the incoming signal into a set of closed frequency channels; the filters have identical bandwidth and span the whole input spectrum. Using the WP-decomposition method, different subband filtering schemes can be designed, fabricating trees of quadrature mirror filters with the fiber or the integrated optics technology.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:38 ,  Issue: 10 )