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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Q. The received signal through polarization diversity reception is linearly polarized.

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Q. ASK with heterodyne detection can achieve same SNR limit as ASK with asynchronous detection.

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Q. In a ______________ receiver, the analyses of signal and noise phenomena are more complicated than in the IM-DD case.

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Q. FSK modulation is attributed to the use of __________ frequencies unlike ASK modulation.

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Q. BER of FSK modulation scheme is ________ as/to the ASK modulation scheme.

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Q. ___________ can also be used in place of multilayered filters in the dual filter direct detection FSK receiver.

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Q. FSK synchronous detection is _________ more sensitive than asynchronous heterodyne detection.

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Q. The asynchronous heterodyne detection is _________ more sensitive than the dual filter direct detection FSK receiver.

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