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Fibre Optics

*****IMPORTANT Q2 & Q4*******

(MODEL EXAMPLES WILL BE GIVEN FOR EASIER SOLVING)

1. A silica multimode step-index fiber has core and cladding refractive indices of 1.48 and 1.46, respectively. The equilibrium length of the fiber is 2 km. The light source emits at 820 nm and has a spectral width of 120nm. Compute the electrical 3-dB bandwidth of a 5-km length of this fiber and the maximum RZ and NRZ data rates.

Repeat the problem for a Graded-index fiber when the spectral width of the

light source is reduced to 20 nm.

2. 20 SI fibers, 2 km long each, are spliced together for a 40 km link. Each fiber has a loss rate of 1-dB/km and a numerical aperture of 0.24. Each splice adds 0.5 dB of loss. A laser diode has a threshold current of 10 mA and emits at 3 mW/mA rate. A diode current of 15 + 3sin t (mA) produces an optical signal, which is coupled into this 40 km SI fiber. After 20-km propagation length, an erbium-doped fiber amplifier having a gain of 15 dB amplifies the signal before the signal is recorded by a photodetector at the end of this link. This photodector has a responsivity = 0.5 A/W and a load resistance of 100 . Two connectors are used and each one has 1 dB loss.

Compute the signal voltage at the detector’s output.

3. An analog system has a bandwidth of 10 MHz, a photodetector of = 0.5 A/W and ID = 1 nA, and a signal to noise ratio (SNR) of 30 dB. The receiver’s temperature is 270 C and the load resistance is 50 .

(a) How much optic power must reach the receiver?

(b) Complete the system design if the fiber length is 5 km.

4. Design a digital system transmitting a 1-Gbps RZ signal over a 50-km path without the use of repeaters. The error rate must be 10 or better.

(Please list the components in the summary of each design )

Habilidades: Engenharia de Telecomunicações

Veja mais: multimode fiber, maximum path, design optics, engineering rates, snr, rz, path loss, mw, fibre, fiber optic, current voltage, cladding, fibers spliced together fiber loss splice adds, indices, voltage design, fibre optic, diode laser, voltage power amplifier, telecommunications engineering, voltage amplifier design

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