Dielectric optical fibers are exploited in the telecommunications industry below infrared frequencies. Select one: True O False
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- A planar LED is fabricated from gallium arsenide which has a refractive indexof 3.6. Calculate the optical power emitted into air as a percentage of theinternal optical power for the device when the transmission factor at thecrystal–air interface is 0.68. When the optical power generated internally is 50% of the electric powersupplied, determine the external power efficiency.The effective span of an antenna is 2.147 m2 at an operating frequency of 100MHz. The antenna has no conduction or dielectric loss. The input impedance of the antenna is 75Ω and it is connected to a 50Ω transmission line. Find the directionality of the antenna system. (The term "system" here refers to the effects of binding to the transmission line.) It will be assumed that there is no polarization loss.1. Discuss in detail the construction of a Directional Coupler. 2. Discuss in detail whether the incident energy can be sampled or not with pick up probe at port ‘4’.
- The numerical input/output mean optical power ratio in a 1 km, length of optical fiber is found to be 2.5. Calculate the received mean optical power when a mean optical power of 1 mW is launched into a 5 km length of the fiber (assurning no joints or connectors).A certain antenna has a gain of 7 dB with respect to an isotropic radiator. What is its effective area (in m^2) if it operates at 200 MHz? Round off your answer into two decimal places.Design a microstrip line on a 0.5 mm alumina substrate (er = 9.9, tan o = 0.001) for a 50 characteristic impedance. Find the length of this line required to produce an electric length of 270 at 10 GHz,
- An optical fiber link with a distance of 30km long has a loss of 0.3dB/km. a) Calculate the minimum optical power level that must be launched into the fiber to maintain an optical power level of 3.0W at the receiving end.b) Estimate the required input power if the fiber has a loss of 0.6dB/km.c) Differentiate, with the aid of diagrams, the types of these dispersions and its effect on the transmission distance. (i) Modal Dispersion(ii) Chromatic Dispersion(iii) Polarization Mode DispersionPlease I need a 100 % correct answer some websites are answering the questions by using the frequency and some by using the effective aperture An antenna transmits a power of 2W from an antenna of 20db, towards a receiver located 40 km from the receiver, calculate the power received by an antenna of effective antenna 10 m^2 if the operating frequency is 11 KHzThe total power delivered to the radiator of an isotropic antenna is 200,000 W. Determine the power density at a distance of 100 m.
- The maximum deviation of an FM channel allowed is 15.0 kHz at frequencies up to 3.6001 kHz. Using Carson’s rule, determine the bandwidth of the FM channel. Round the final answer to two decimal places. kHzFor an optical fiber, the numerical aperture is 0.25, the core diameter is 20 mm and wavelength is 1.55 mm. Find the V number of the fiber.For an AM Radio channel, calculate the power efficiency of a system when the carrierroot-mean-square voltage is √20 V and the modulation index is 50%.