Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1541415 | Optics Communications | 2007 | 6 Pages |
Abstract
This paper proposes 1 Ã N add-drop filter structures in which only one thin-film filter (TF) is used. Our key idea is based on a combination of an angle-multiplexing concept and the flexibility of the optical fiber to allow a multiwavelength optical beam hit the TF several times, each time at a different angle but same position. Due to the TF angle sensitivity, the desired wavelength optical beam corresponding to the incident angle is therefore spatially isolated from the main optical beam. Our first TF-based 1 Ã N add-drop filter structure is arranged in a reflective design in which N wavelength optical beams can be dropped out from the main channel. For our transmissive architecture, N â 2 channels are directed to their associated output terminals while the remaining λNâ1 and λN wavelength optical beams are sent out at the same port. Experimental proof of concept for our reflective TF-based 1 Ã 3 add-drop filter using one off-the-shelf TF, a triple fiber-optic collimator, and an optical circulator separates two wavelength optical beams with their channel spacing of 0.8 nm from the main channel. In this case, measured optical losses of 0.67 dB, 1.66 dB, and 2.59 dB are obtained for the first, the second, and the remaining dropped wavelength optical beams, respectively. Optical crosstalk and polarization dependent loss of <â18 dB and <0.08 dB are also investigated, respectively.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Sarun Sumriddetchkajorn, Kosom Chaitavon,