Beat length measurement in directional couplers by thermo-optic modulation
Gnewuch, H, Roman, J E, Hempstead, M, Wilkinson, J S and Ulrich, R (1996) Beat length measurement in directional couplers by thermo-optic modulation. Opt. Lett., 21, (15), 1189-1191.
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Description/Abstract
In integrated optical directional couplers formed by two parallel waveguides, we measure the difference Δβ = βeven - βodd between the propagation constants of the 'supermodes'. They are coupled locally by heating a fine spot on one of the guides. When the spot is scanned along the coupler the output power from one of the guides is found to vary periodically. The period of variation is the modal beat length λ = 2π/Δβ. We demonstrate this technique with directional couplers fabricated by K+-exchange in glass. Beat lengths in the range of 0.6 ... 2.2 mm are measured with an accuracy of ±0.3%.
| Item Type: | Article |
|---|---|
| Related URLs: | http://www.orc.soton.ac.uk/vie...l?pid=1176 |
| Divisions: | Faculty of Physical and Applied Science > Optoelectronics Research Centre |
| ePrint ID: | 255299 |
| Deposited On: | 02 Apr 2001 |
| Last Modified: | 02 Mar 2012 11:58 |
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