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Investigation of adjacent channel crosstalk in multichannel monolithically integrated 1.55 μm photoreceiver arrays

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6 Author(s)
Syao, Kao-Chih ; Solid State Electron. Lab., Michigan Univ., Ann Arbor, MI, USA ; Kyounghoon Yang ; Xiangkun Zhang ; Liang-Hung Lu
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We have investigated adjacent channel crosstalk in 3-, 8-, and 16-channel InP-based monolithically integrated p-i-n/HBT photoreceiver arrays, with a channel bandwidth of 11 GHz. By using a novel monolithically integrated radiation shield, we have been able to reduce the crosstalk to -35 dB at 10 GHz. These parameters represent the best performance in multichannel integrated photoreceiver arrays. The two main components of crosstalk are found to be radiation crosstalk and electrical crosstalk and these are separately dependent on interchannel spacing and single- or dual-source biasing schemes. An electromagnetic full-wave solution shows that the measured crosstalk in arrays without the radiation shield could be dominated by radiation crosstalk, which can be modeled as a capacitive coupling between adjacent channels. Similarly, electrical crosstalk can be modeled by equivalent parasitic resistive and inductive elements. Values of these circuit elements have been determined by analyzing experimental data

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Lightwave Technology, Journal of  (Volume:15 ,  Issue: 10 )