In contrast to high-frequency electrical clock pulses of microprocessors, the shorter optical pulse and the higher rate of optical pulses means faster optical computation and communication applications. This paper provides several new methods for generating short optical pulses having a high repeating rate These methods are categorized into two areas; generating methods for higher bit rates and generating methods for shorter duration pulses. These methods may go beyond current borders of optical bit rates and ultrashort optical pulses but subject to more future lab investigations.
Post communication modulation by implementation of polarization entangled photons, or post transmission communication is a novel method by in which raw data photons is transmitted to the receiver and transmitter from an entangled photon source through two distinct polarization maintaining optical fiber. A pair of photons is generated in entangled photons source, one of twin photons e.g. |V> is sent to the transmitter and its counterpart e.g. |H> is sent to the receiver through the two links of polarization-maintaining optical fibers, having exactly the same length to guarantee reaching of photons to transmitter and receiver exactly at the same time. When one of entangled photons is ready to be polarization modulated in the transmitter, its twin photon is ready in the receiver to be read. We know the polarization of each one of twin entangled photons transmitted to receiver and transmitter, because the polarization is maintained through the fiber and by tuning and checking some photons in receiver and transmitter we can find the normal incidence polarization. When polarization of one of the photons in the transmitter is changed, this causes changing of photon counterpart in the receiver at zero-time delay. This makes zero-time communication possible ignoring transmission delay of optical fiber classical link. On the other hand, entangled photon enhancer is proposed here, because due to no-cloning theorem, it is impossible to use optical amplifier to amplify entangled photons.
Post communication modulation by implementation of polarization entangled photons, or post transmission communication is a novel method by in which raw data photons is transmitted to the receiver and transmitter from an entangled photon source through two distinct polarization maintaining optical fiber. A pair of photons is generated in entangled photons source, one of twin photons e.g. |V> is sent to the transmitter and its counterpart e.g. |H> is sent to the receiver through the two links of polarization-maintaining optical fibers, having exactly the same length to guarantee reaching of photons to transmitter and receiver exactly at the same time. When one of entangled photons is ready to be polarization modulated in the transmitter, its twin photon is ready in the receiver to be read. We know the polarization of each one of twin entangled photons transmitted to receiver and transmitter, because the polarization is maintained through the fiber and by tuning and checking some photons in receiver and transmitter we can find the normal incidence polarization. When polarization of one of the photons in the transmitter is changed, this causes changing of photon counterpart in the receiver at zero-time delay. This makes zero-time communication possible ignoring transmission delay of optical fiber classical link. On the other hand, entangled photon enhancer is proposed here, because due to no-cloning theorem, it is impossible to use optical amplifier to amplify entangled photons.
Extending some new ideas on the topic of thermoelectric generator modules (TEGs), this paper analysis theoretically and mathematically the efficiency of thermoelectric modules when there is a specific cryogenic temperature on cold side i.e. exactly when the cold side temperature is -157°C, which is the temperature of shadow side of space stations (satellites and approximately surface temperature of moon and mars planets during nights) and there is 121°C on hot side of TEG module that is the temperature on sun-facing side of space stations (satellites and approximately surface temperature of moon and mars planets during days), and it also follows some independent new ideas to increase efficiency of TEG modules in all conditions, that is implementation of periodic structure of terahertz piezoelectric materials as chirped tilted superlattice for the phonon reflection to decrease thermal conductance significantly and benefit from piezoelectric characteristic of zinc oxide to harvest some fraction of wasted thermal energy as well.
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