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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Q. The digital transmission on implementation of polarization modulation which involves polarization characteristics of the transmitted optical signal is known as _____________

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Q. _________ heterodyne detection does not require phase matching between the incoming signal and the local oscillator.

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Q. In ___________ detection, the phase of the local oscillator signal is locked to the incoming signal.

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Q. The introduction of nonlinear element within the ______ is necessary to enable efficient carrier recovery.

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Q. What is the main attraction of the optical homodyne detection?

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Q. The phase difference between the local oscillator and the source must be ________ for high sensitivity reception.

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Q. How many strategies of homodyne demodulation have proved to be successful for coherent optical fiber reception?

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Q. In the __________ receiver, the incoming signal is not precisely shifted to the baseband.

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Q. The use of PLL can be avoided in the intra-dyne detection.

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Q. Phase diversity reception is also referred to as ______________

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