Q. ______________ are operated at current beyond normal lasing threshold current, practically.

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Q. An uncoated FPA has peak gain wavelength 1.8 μm, mode spacing of 0.8 nm, and long active region of 300 v. Determine RI of active medium.

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Q. Determine the peak gain wavelength of uncoated FPA having mode spacing of 2 nm, and 250 μm long active region and R.I of 3.78.

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Q. An SOA has net gain coefficient of 300, at a gain of 30 dB. Determine length of SOA.

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Q. An SOA has length of 35.43×10⁻³ m, at 30 dB gain. Determine net gain coefficient.

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Q. An SOA has mode number of 2.6, spontaneous emission factor of 4, optical bandwidth of 1 THz. Determine noise power spectral density.

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Q. An SOA has noise power spectral density of 1.18 mW, spontaneous emission factor of 4, optical bandwidth of 1.5 THz. Determine mode number.

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Q. The spectral dependence on gain is always constant.

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Q. ESA ________ the pumping efficiency of device.

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Q. Signal amplification is obtained in ____________

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Q. It is possible to construct a single rare-earth-doped fiber amplifier which provides amplification for all-bands.

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Q. _______________ is constructed using erbium-doped glass.

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Q. ____________ uses Er³⁺-doped erbium glass.

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Q. The most advantageous amplification is ____________

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Q. _________ is also known as lump Raman amplifiers.

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Q. _______________ extends the pump power into transmission line fiber.

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Q. _____________ are called hybrid Raman amplifier.

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Q. In ___________ the ASE contributes most of noise.

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Q. In _____________ Rayleigh scattering can be reduced.

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Q. Compute the fiber nonlinear coefficient of a parametric optical amplifier having parametric peak gain of 63.6 dB, signal power of 1.6W, length 520.

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