Download Advanced Optoelectronic Devices by Professor Daniela Dragoman, Professor Mircea Dragoman PDF

By Professor Daniela Dragoman, Professor Mircea Dragoman (auth.)

ISBN-10: 3642084354

ISBN-13: 9783642084355

ISBN-10: 3662039044

ISBN-13: 9783662039045

Advanced Optoelectronic units offers the 1st unified presentation of the key advancements during this box, either by way of their actual history and with appreciate to purposes. It covers units in response to the homes of quantum wells and fiber optics including their purposes in optical communications and sign processing. it's also a accomplished mathematical therapy and state of the art presentation of the most recent learn in utilized optoelectronics and semiconductor physics. the 2 diverse and complementary actual theories that describe optoelectronic units, particularly the electromagnetic box thought and quantum mechanics, are handled together in any such approach as to bare hyperlinks and analogies at any place attainable. this gives a greater knowing of the elemental techniques. consequently, the booklet isn't easily a list of other unique units yet a presentation of a very good number of units according to a similar, or comparable, actual phenomena.

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48) and to OUf supposition that the perturbation is due to the presence of the other waveguide, we arrive at the conclusion that Ci,i are negligible for guided modes since n 2 - n~ (we have supposed real refraction indices) is equal to zero over the region occupied by the waveguide i. The only contribution to Ci,i comes from the integral over the waveguide j i, where the field components of the waveguide i are very small (the guided fields are concentrated in the region of the respective waveguide).

The reflectivity curve is nonsymmetrically shifted for the two propagating directions; it is possible to use it as a one-way-only dichroic reflective filter. 3 Tunable Distributed Feedback and Distributed Bragg Reflector Lasers In many applications tunable light sources are needed. One of the simplest ways to tune the wavelength of a DFB laser is to vary the ridge width of the laser, modifying in this way, in a controllable manner, the modal index of the waveguide structure. 4 Coupled Mode Method in Perturbed Waveguides 45 functions of the tilt angle.

A conventional Bragg reflector used as a mirror usually consists of altemating layers with high and low refractive indices, the optical lengths of the layers being equal to A, /4. The CL parameter which determines the reflection coefficient is in this case a function of the number of pairs and the difference between the refractive indices in the altemating layers. The phase difference between the rays reflected from the interfaces of a layer with refractive index n and length I, for a normal incidence upon the structure, must be - exp( - 2ikon/) = - exp( - 2ikon( A, /4n)) = - exp( - in) (the light reflected within the high index layer does not suffer any phase shift at reflection, whereas that reflected within the low index layer undergoes a phase shift of 180°).

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