Computer Engineering

Computer Engineering Paper details: Course : Optical Computer System ELG5103 Optical Communications Systems Assignment 2 Waves in a Slab Waveguide Hint: The electric field distribution varies depending on the confinement factor and the dispersion relation. To find the electric field distribution inside the core and the cladding you will need to find K & y which will involve solving the dispersion relation for a particular value of V - this may be done with a few lines of Matlab. See supplementary material. 3) To keep the notation light-weight it may be assumed that one is only concerned with TE-like modes with transverse amplitude profiles adequately described by scalar valued eigenfunctions (pp associated to an eigenvalue 3,, corresponding to the propagation constant of the mode i.e. up (x, z) = (pp (x) exp(i,6’pz) The (pp are orthonormal with respect to an inner product: (‘pp"pq) = 6m The inner product may take different forms but it is always linear in the first argument and conjugate linear in the second argument and for purpose of this problem may be taken1 as: (em wq) - I epwqu - 6pc: The set of eigenfunctions is complete. Suppose light is launched into a waveguide corresponding a total forward going field 1? , exploit the orthonormality of the modes relative to the inner product to find the coefficients of the expansion of the field ‘1’ as linear combination of the modes. What I The electric 5,, and magnetic fields of propagating modes of a dielectric waveguide satisfy the orthogonality condition: fi(£,,xfl;+5; xup).ds= (SW No longitudinal component takes part in this integral and so one may considerthe transverse components only. In the special case of TE & TM modes, the TE mode is always orthogonal to a TM mode and vice versa. It is therefore only necessary to consider the orthogonality within the set of TE and TM modes: For TE one notes that only the 3 component of H x contributes and: as), HI. O( E = IKE), For TM one notes that only the 3 component of E , contributes and: 1 as 1 5 -” = ' -E x cc 722(x) dz ll? 122(x) y Hence with suitable normalization one finds: (‘PpKM : [(pp<pq'dx = 5m TE and OS 1 (ewq) = I W em dx = 5w W ELG5103 Optical Communications Systems Assignment 2 Waves in a Slab Waveguide Hint: The electric field distribution varies depending on the confinement factor and the dispersion relation. To find the electric field distribution inside the core and the cladding you will need to find K & y which will involve solving the dispersion relation for a particular value of V - this may be done with a few lines of Matlab. See supplementary material. 3) To keep the notation light-weight it may be assumed that one is only concerned with TE-like modes with transverse amplitude profiles adequately described by scalar valued eigenfunctions (pp associated to an eigenvalue 3,, corresponding to the propagation constant of the mode i.e. up (x, z) = (pp (x) exp(i,6’pz) The (pp are orthonormal with respect to an inner product: (‘pp"pq) = 6m The inner product may take different forms but it is always linear in the first argument and conjugate linear in the second argument and for purpose of this problem may be taken1 as: (em wq) - I epwqu - 6pc: The set of eigenfunctions is complete. Suppose light is launched into a waveguide corresponding a total forward going field 1? , exploit the orthonormality of the modes relative to the inner product to find the coefficients of the expansion of the field ‘1’ as linear combination of the modes. What I The electric 5,, and magnetic fields of propagating modes of a dielectric waveguide satisfy the orthogonality condition: fi(£,,xfl;+5; xup).ds= (SW No longitudinal component takes part in this integral and so one may considerthe transverse components only. In the special case of TE & TM modes, the TE mode is always orthogonal to a TM mode and vice versa. It is therefore only necessary to consider the orthogonality within the set of TE and TM modes: For TE one notes that only the 3 component of H x contributes and: as), HI. O( E = IKE), For TM one notes that only the 3 component of E , contributes and: 1 as 1 5 -” = ' -E x cc 722(x) dz ll? 122(x) y Hence with suitable normalization one finds: (‘PpKM : [(pp<pq'dx = 5m TE and OS 1 (ewq) = I W em dx = 5w W