Ch8Sec1 - Dr. Joseph C. Palais 8.1 1 THE FIBER FORUM Fiber...

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Unformatted text preview: Dr. Joseph C. Palais 8.1 1 THE FIBER FORUM Fiber Optic Communications PRESENTED BY Dr. JOSEPH C. PALAIS Dr. Joseph C. Palais 8.1 2 Chapter 8 Couplers and Connectors Dr. Joseph C. Palais 8.1 3 Section 8.1 Connector Principles Dr. Joseph C. Palais 8.1 4 2a 2a d d Core Core Four major loss mechanisms are: 1) Lateral Misalignment Dr. Joseph C. Palais 8.1 5 2) Angular Misalignment 2) Angular Misalignment θ θ 3) 3) Non-Contacting Ends Non-Contacting Ends x Dr. Joseph C. Palais 8.1 6 4) Rough Ends Dr. Joseph C. Palais 8.1 7 Connector P in P out η = = Coupling Efficiency L = - 10 Log η (dB) (dB) out in P η= P Dr. Joseph C. Palais 8.1 8-- =-- 2 1 1 2 d d d η cos 1 π 2a 2a 2a d cos 2a is in radians (8-1) 8.1.1 Lateral Misalignment The lateral misalignment loss for a multimode step-index (SI) fiber is given by: Dr. Joseph C. Palais 8.1 9 Assume the fiber end illumination distribution is uniform. The coupling efficiency is equal to the fractional overlap of the transmitting and receiving fiber cores, as illustrated on the next slide. Derivation Lateral Misalignment Dr. Joseph C. Palais 8.1 10 y a d/2 d A = Overlap Area θ m θ x r Dr. Joseph C. Palais 8.1 11 2 4 m a d r C O S A r d r d θ θ θ = = Radius = r Area element = rdrd θ dr d rd θ θ θ Lateral Misalignment Dr. Joseph C. Palais 8.1 12 θ r d/2 θ = d cos 2r θ = d r 2cos Determining m θ θ a d/2 m = m d/2 cosθ a- = 1 m d θ cos 2a Lateral Misalignment Dr. Joseph C. Palais 8.1 13 Now, ( 29 2-- = =- =- = =-- =- & & & & m m m m m 2 a d 2cos 2 2 2 2 2 2 2 2 1 2 2 2 1 r A 4 d 2 d 2 a d 2cos d d 2 a 4 cos d tan cos d d A 2 a cos tan 2a 4 a d/2 d d A 2 a cos 2a 4 d/2 θ θ θ θ θ θ θ θ θ θ θ θ θ θ Lateral Misalignment Dr. Joseph C. Palais 8.1 14 The functional overlap is :- = = - - = - 2 2 1 A η a 2 d d d η cos 1 2a 2a 2a L 10logη π π 0.2 0.4 1 2 3 4 5 Fractional Lateral Offset Loss(dB) 10 log 2 π acos x ( ) x ( ) 1 x ( ) 2- ⋅- ⋅ ⋅ - x x = d/2a Lateral Misalignment Dr. Joseph C. PalaisDr....
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This note was uploaded on 05/11/2010 for the course EEE EEE-546 taught by Professor Palais during the Spring '10 term at ASU.

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Ch8Sec1 - Dr. Joseph C. Palais 8.1 1 THE FIBER FORUM Fiber...

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