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Quantifying direct DQPSK receiver with integrated photodiode array by assessing an adapted common-mode rejection ratio

: Wang, J.; Lauermann, M.; Zawadzki, C.; Brinker, W.; Zhang, Z.; Felipe, D. de; Keil, N.; Grote, N.; Schell, M.


Duan, G.-H. ; IEEE Photonics Society; Optical Society of America -OSA-, Washington/D.C.; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Optoelectronic Materials and Devices VI : 13 - 16 November 2011, Shanghai, China
Bellingham, WA: SPIE, 2011 (Proceedings of SPIE 8308)
ISBN: 978-0-8194-8956-2
Paper 83080R
Conference "Optoelectronic Materials and Devices" <6, 2011, Shanghai>
Fraunhofer HHI ()

In this work, a direct DQPSK receiver was fabricated, which comprises a polymer waveguide based delay-line interferometer (DLI); a polymer based optical hybrid, and two monolithic pairs of > 25 GHz bandwidth photodiodes that are vertically coupled to the polymer planar lightwave circuit (PLC) via integrated 45Y mirrors. The common mode rejection ratio (CMRR) is used to characterize the performance of coherent receivers, by indicating the electrical power balance between the balanced detectors. However, the standard CMRR can only be measured when the PDs can be illuminated separately. Also, the standard CMRR does not take into account the errors in the relative phases of the receiver outputs. We introduce an adapted CMRR to characterize the direct receiver, which takes into account the unequal responsivities of the PDs, the uneven split of the input power by the DLI and hybrid, the phase error and the extinction ratio of the DLI and hybrid.