Integrated MQW Intermixed InGaAsP/InP Waveguide Photodiodes

Bhowmick, Tathagata; Das, Utpal

doi:10.1364/aoe.2008.sak38

Cited by 1 publication

(1 citation statement)

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“…The velocity has been assumed to be constant for all MQW at 2x10 6 cm -1 . The RC time constant for these PDs have been evaluated using 22 and it has been observed that the speed limiting factors in these PDs are mainly determined the tunneling effect. However, by considering Single QW structure the tunneling time effect can be eradicated but in such cases the confinement factor and hence the efficiency will degrade.…”

Section: Modelmentioning

confidence: 99%

40GHz integrated multi quantum well intermixed waveguide photodiodes

Bhowmick

Das

2012

16th International Workshop on Physics of Semiconductor Devices

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InGaAsP/InP Multi Quantum Well (MQW) based rib waveguide (WG) multi-wavelength PIN type photodiodes (PD) have been designed for Coarse Wavelength Division Multiplexing (CWDM) systems in which spatial bandgap tailoring have been accomplished by using post growth Fluorine (F) implanted QW Intermixing (QWI) as the integration mechanism. Two separate structures with different composition but same well widths are necessary to detect all CWDM wavelengths in which a In 0.5540 Ga 0.4460 As 0.9489 P 0.0511 /InP (15nm/15nm) MQW structure has a 14 channel coverage which spans from 1350-1610nm. The thicknesses of the i-MQW layer and different layers constituting the WG have been optimized to give a maximum efficiency of 22%. A carrier tunneling time of 20ps along with the transit time limited bandwidth of 86GHz gives a 3dB bandwidth of 43GHz by optimizing the i-MQW thickness and dopant concentration of the different layers of the waveguide. For all 18 channels insertion loss of 0.4-23dB has been obtained for a detection sensitivity of 21dB. Design issues related to the contact formation for extracting the photo-generated microwave power in such photodiodes have been presented along with few fabrication details of the integration process.

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Section: Modelmentioning

confidence: 99%