Reference no: EM131221388
An optical ?bre transmission system consists of a circular LED source, a 2-metre length of optical ?bre and a circular PIN diode detector. Both the source and detector are positioned 100 µm from the ends of the ?bre. Detailed data for the source, a glass ?bre, a polymer ?bre and the detector are given below. Use this data to perform the following calculations.
(a) The total power Ps emitted by the source in all directions (use eqn [15.23b]).
(b) The numerical aperture and maximum angle of acceptance of the glass ?bre.
(c) The numerical aperture and maximum angle of acceptance of the polymer ?bre.
(d) The source and detector are linked by the glass ?bre; calculate the power input to the ?bre, the ?bre transmission factor, and power output from the ?bre. (Hint: use PIM/R=KSM and POM/PIM = T.)
(e) The source and detector are now linked by the polymer ?bre; calculate the power input to the ?bre, the ?bre transmission factor, and power output from the ?bre.
(f) For both the glass system of (d) and the polymer system of (e), calculate the power incident on the detector and the detector output current. (Hint: use PD/POM = KMD.)
LED source Radiance = 10 W cm-2 sr-1 Diameter = 200 µm Centre wavelength = 810 nm Glass ?bre Multimode step index Core diameter = 100 µm Core refractive index = 1.5 Core-cladding index difference = 0.015 Attenuation at 810 nm = 5 dB km -1 Fibre length = 2m Polymer ?bre Multimode step index Core diameter = 1.0 mm Core refractive index = 1.65 Core cladding index difference = 0.04 Attenuation at 810 nm = 500 dB km-1 Fibre length = 2m PIN diode detector Diameter = 2.0 mm Centre wavelength = 810 nm Responsivity at 810 nm = 0.55 A W-1.
|
Suppose equilibrium in a financial market
: What is an expression for Y in terms of i (i.e. Y = ....) Suppose the central bank holds the money supply constant. Using part a's answer, derive dy/di. What's the sign? How does it relate to the slope of LM curve derived in class? (hint: if y=1/..
|
|
Determine net income for its first year of operations
: Stanton Corp. began operations on January 1, 2016. The statement of cash flows for the first year reported dividends paid of $143,000. The balance sheet at the end of the first year reported $55,000 in dividends payable and $475,000 in ending retaine..
|
|
Which of these six vectors are the support vectors
: Starting with your answer to part (b), use gradient descent to find the optimum w and b. Note that if you start with a separating hyper plane, and you scale w properly, then the second term of Equation 12.4 will always be 0, which simplifies your ..
|
|
Claim expenses for environmental cleanup-asbestos removal
: How to account for $2.5 million payment from Insurance Company, How and when to claim expenses for environmental cleanup and asbestos removal, How much depreciation to claim in 2015 and 2016.
|
|
Calculate the power input to the ?bre
: The source and detector are linked by the glass ?bre; -calculate the power input to the ?bre, the ?bre transmission factor, and power output from the ?bre.
|
|
Reallocating production between two plants
: Given these data, how, if at all, would you recommend reallocating production between these two plants? Briefly explain why.
|
|
Calculate the expected value of the acceleration
: Newton's first law says a body at rest will remain at rest unless acted upon by an outside force, and a body in motion will continue in motion at the same speed and in the same direction unless acted upon by an outside force. What forces were acti..
|
|
Expect the dollar to depreciate against the pound
: Suppose markets expect the dollar to depreciate against the pound. In order to make a profit, what must happen to E relative to market expectations?
|
|
Compute an estimate the principal eigenvalue for the matrix
: Starting with a vector of three 1's, use power iteration to find an approximate value of the principal eigenvector.
|