15 citations · 37 across the 4 of their papers we have counts for
4 papers
Spectrum Sensing in Cognitive Radios Based on Multiple Cyclic Frequencies
Jarmo Lundén, Visa Koivunen, Anu Huttunen +1
Cognitive radios sense the radio spectrum in order to find unused frequency bands and use them in an agile manner. Transmission by the primary user must be detected reliably even i…
Effect of wavelength dependence of nonlinearity, gain, and dispersion in photonic crystal fiber amplifiers
A. Huttunen, P. Torma
Photonic crystal fibers are used in fiber amplifiers and lasers because of the flexibility in the design of mode area and dispersion. However, these quantities depend strongly on t…
Conditions for waveguide decoupling in square-lattice photonic crystals
Timo Koponen, Anu Huttunen, Paivi Torma
We study coupling and decoupling of parallel waveguides in two-dimensional square-lattice photonic crystals. We show that the waveguide coupling is prohibited at some wavelengths w…
Guiding and reflecting light by boundary material
A. Huttunen, K. Varis, K. Kataja +2
We study effects of finite height and surrounding material on photonic crystal slabs of one- and two-dimensional photonic crystals with a pseudo-spectral method and finite differen…