| Date |
Summary |
11/5 |
OPTICAL SOURCESDiscussed optical receiver operation and performance.
Discussed error sources and developed the probability of error in decyphering digital bits of data and derived bit error rate (BER).
Developed the Q parameter in terms of signal variance and showed how it is used as a measure of optical system performance.
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10/17 | OPTICAL SOURCESDiscussed the launching of optical power into fibers , the source output pattern for LEDS ans Laser Diodes.
Derived the expressions for optical power coupled into step- and graded-index fibers.
Discussed varoius fiber-fiber missalignments.
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| 10/15 | OPTICAL SOURCES
Discussed semiconductor for Lasers : the difference between spontaneous and stimulated emission and population inversion.
Gave the conditions and definations for coherence
Discussed the Distributed Feedback (DFB) laser , the fabre Perot resonator and Bragg gratings.
Discussed the output pettren of a laser source.
Presented the conditions for lasing to occur.
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| 10/10 | OPTICAL SOURCES
Outlined types of sources and there top - level characteristics.
Gave a review of solid - state physics.
Discussed direct and indirect bandgap associated with semiconductor materials and the fabrication of certain quaternary and ternary semiconductor to impose only direct bandgap lattice structures.
Discussed double heterostructure design for light emitting diodes (LEDS) , internal quantum efficiency , effective carrier lifetime , nad surface and edge emitter configurations.
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| 10/08 | Dispersion (Continued)
Discussed intermodal dispersion and polarization mode dispersion (PMD).
Discussed intramodal dispersions and developed its tow components - waveguide dispersion and material dispersion.
Discussed the quadruple-clad single-mode fiber and its effects on dispersion flatening over a broad band.
Discussed dispersion in graded-index fibers.
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| 10/03 |
- Discussed attentuation , its effects on the signal strength , its units ( nepers or dB ) and its sources - namely , absorption and scattering.Gave emperical expressions for absorption loss as a function of operating wavelenght
l and mole fraction associated with the fiber material.Gave the emperical expression for scattering loss as a function of
l , isothermal compressability , and the cooling set temperature in the fiber manufacturer.
- Discussed dispersion , its effects on a signal , dispersion types , and sources.Developed expressions for phase velocity , group velocity , and group velocity.dispersion (GVD) stemming from Taylor-series expansion of
b (w+Dw). Expressed group delay
gg interms of
w and alternatively in terms of l.
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| 9/24 |
- Discussed the concept of fiber birefringence and its manifestations into a beating between two modes having nearly the same phase constant.
- Discussed the fiber beat lenght and its utility as a sensor in acousto-optics.
- Derived the numerical aperature for graded-index fibers.
- Presented the expression for the number of modes in graded index fiber.
- Rederived the wave equations for graded-index fibers and discussed the effect of setting Dd to zero.
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| 9/19 |
- Discussed the concept of dispersion equation as the eigenvalue equation and the resulting dispersion diagram.Defined phase velocity and gave their physical interpretation.Constructed the dispersion diagram for the step index fiber.
- Gave an example of a non-dispersion TEM case.
- Discussed the field distribution for the TE0m, TM0m, HE11 modes.
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| 9/17 |
- Finished the solution to the Helmholtz wave equation for the step-index fiber and described the nature of the applicable Bessell functions.
- Developed the transverse field components in terms of the longitudinal components.
- Showed how the boundary conditions are used to develop the eigen - value equation
f(w , b) = 0 .
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| 9/12 |
- Derived the Helmholtz wave equations for the fields in a step index Fiber. Gave the mathematical setup for its dispersion relation.
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| 9/10 |
- Derived and discussed the concept of solid acceptance angle.
- Derived the ray-optics approach to the calculation of the number of modes that a step-index fiber can support.
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| 9/5 |
- Completed the discussion of Quantum Nature of light.
- Derived the relationship between index of refraction and permittivity.
- Discussed two-conductor, one-conductor, and zero-conductor waveguides.
- Gave the derivation of Critical and Acceptance angle of Numerical Aperture.
- Provided a table for various index difference values.
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| 8/29 |
- Discussed figure 1-3 and touched on sources, detector and optical amplifiers, such as, PDFA and EDFA. Pointed out the positions of Praseodymium (59) and Erbium (68) on the Periodic Table of Elements.
- Discussed Figure 1-5 and the benefits of all optical systems.
- Discussed Fig 1-7 and the historic windows of Fiber Optic operations. Discussed the OH absorption peak at 1.4µ and Alcatel's "All Wave" fiber.
- Presented the Wave Nature of light. Discussed the various types of polarization and showed a computerized demo of polarization.
- Began the Quantum Nature of light.
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| 8/27 |
- Discussed typical fiber optic operating ranges in terahertz and wavelength units and compared these with the visible range.
- Covered the establishment of the 64Kbps Digital Voice standard. Discussed the three levels of ISDN, the North American telephone hierarchy and SONET, and gave a detailed description of the data-rate levels of each. Presented the Maxum Data-Rate Spectrum.
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| 8/22 |
- Gave an introduction to fiber optic communications and discussed the structure of the text-Keiser, 3rd ed. Outlined the topics to be covered per the syllabus and explained the course policies.
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Gave the history of optical transmission. Discussed dB and dBm. Showed where modern fiber optic systems fall within the overall electromagnetic spectrum.
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