Q. ____________ is the principal cause of line width broadening in the coherent devices.

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Q. Which technique was started for narrowing of injection laser line widths?

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Q. The line width tolerance is wider for heterodyne receivers.

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Q. ___________ is an alternative to reduce phase noise and line width requirements.

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Q. ______________ is the progressive spatial separation between the two polarization modes as they propagate along the fiber.

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Q. How many compensator devices are required to provide full polarization-state control?

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Q. Which technique was found to be providing an infinite range of polarization control?

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Q. What is the main drawback of the squeezer?

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Q. The use of balanced receiver compensates the losses due to coupling optics.

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Q. ___________ is the phenomenon which occurs in the single carrier systems due to small refractive index changes induced by the optical power fluctuations.

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Q. _____________ is essentially a crude form of Amplitude shift keying.

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Q. Almost _________ of the transmitter power is wasted in the use of external modulators.

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Q. The line width in the range ________ of bit rate is specified for ASK heterodyne detection.

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Q. ______________ is also referred to as on-off keying (OOK).

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Q. ________ does not require an external modulator.

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Q. The frequency deviation at frequencies above 1 MHz is typically ____________

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Q. ___________ offers the potential for improving the coherent optical receiver sensitivity by increasing the choice of signalling frequencies.

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Q. Eight level FSK and binary PSK yields an equivalent sensitivity.

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Q. External modulation for ________ modulation format allows the most sensitive coherent detection mechanism.

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Q. _________ can potentially provide spectral conservation through the use of multilevel signalling.

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