Photovoltaic modulating retroreflectors for low power consumption free space optical communication systems




HIGHLIGHTS
  • What: Subsequently, the responsivity was evaluated and compared with the approach described, following .
  • Who: Tiffany McKerahan from the (UNIVERSITY) have published the research work: ORCA – Online Research , in the Journal: (JOURNAL)
  • How: The following criteria were evaluated 1) the presence of the asymmetric Stark effect 2) a ground_state transition energy within the c-band range and 3) minimal lattice mismatch or a potential for strain-balancing. * 𝐿𝑏 was the thickness of the barrier. 𝑚𝑏𝑖 was the effective mass in the barrier for a given band.
  • Future: Characterization following epitaxy would be required to determine and then optimize these parameters in future studies.
SUMMARY

    F REE space optics (FSO) is a secure, high bandwidth method of wireless communication without spectrum licensing requirements. The authors investigated epi-structures for electroabsorption modulators, which are capable of detecting an incident beam under a zero-bias condition prior to modulation to reduce power consumption. The fraction of light absorbed by a single quantum well was then calculated to draw comparison between the proposed structure, a quantum well photodiode and a coupled quantum well modulator structure, from the literature composed of varied materials and geometries. 𝐻𝑖 was the effective barrier height of the band 𝑖, relating to the energy difference between the barrier and the ground_state energy level in the well. The following criteria were evaluated, 1) the presence of the asymmetric Stark effect, 2) a ground_state transition energy within the c-band range, and 3) minimal lattice mismatch, or a potential for strain-balancing. * 𝐿𝑏 was the thickness of the barrier. 𝑚𝑏𝑖 was the effective mass in the barrier for a given band. The authors observe a sharp decrease in γwell at 1550nm due to the redshift and reduction in wavefunction overlap of the ground_state transition with reverse bias. The ASQW γwell has significantly fewer contributions due to the higher confinement, and larger energy separation to the excited_states in the 4.5nm quantum well, which is particularly pronounced for the valence states. A modelling procedure including calculations for full device band structures, fraction of light absorbed in quantum wells, and responsivity was described. This exhibited a strong asymmetric Stark effect: blueshift and increase in wavefunction overlap for the ground_state transition. @@

Licence: cc-by

Site reference: https://orca.cardiff.ac.uk/id/eprint/167071/1/Post-print v2.pdf

DOI reference: https://www.doi.org/10.1109/jqe.2024.3374101

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source https://magazine.sciencepod.net/photovoltaic-modulating-retroreflectors-for-low-power-consumption-free-space-optical-communication-systems/

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