Unformatted text preview: HW #1
1. Given a wave in air with h = z 5 cos(1012 t + ky )
Find a) ω , b) k , c) propagation direction, d) polarization direction and e) corresponding e .
2. a) Give 3 papers (titles, authors, vol. and page numbers) on ‘‘WDM’’ that were published in Optics and Photonics News. b) Give 5 papers (titles, authors, vol. and page
numbers) on ‘‘add drop multiplexer’’ that were published in IEEE Journal of Lightwave
Technology. c) Give 3 papers (titles and publication dates) on ‘‘soliton’’ that were published in Laser and Focus World as articles within the last 15 years.
3. a) A WDM system has linewidth of 5 nm for one channel, carrier wavelength
λ o = 1. 3 µ m and 100 channels.
Find the bandwidth ∆ν of each channel and the total bandwidth ∆ν total for the whole system assuming that there is no guard band between adjacent channels.
b) Suppose another system with ∆ν total and linewidth for a channel being the same as a)
but λ o = 0. 4 µ m . Find the bandwidth ∆ν of each channel and number of channels.
4. A laser is driven by a current source of 1.5A. Assume the efﬁciency for the laser is 10
electron for 1 photon. The photon energy of the laser is 0.8eV.
a) What are the frequency and wavelength of the laser?
b) Output optical power of the laser.
An EM wave travels in free space with the electric ﬁeld e = (10 y + 5 z ) cos(ω t + 2 y − 4 z ).
Determine a) ω and λ , b) Electric ﬁeld in phasor form, i.e. E , c) time varying magnetic
ﬁeld, i.e. h and d) average Poynting vector, i.e. S ave . ...
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- Spring '11