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Personne :
Mohammadi, Abdolkhalegh

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Mohammadi

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Abdolkhalegh

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Université Laval. Centre d'optique, photonique et laser

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ncf13706395

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  • PublicationRestreint
    Pushing capacity limits with multi-segment SiP modulators
    (IEEE Xplore, 2023-05-29) Wei Shi; Leslie A. Rusch; Zheng, Zibo; Mohammadi, Abdolkhalegh; Zhang, Xiaoguang; Shi, Wei; Rusch, Leslie
    The use of multiple segments on a silicon photonic modulator can increase bandwidth at the cost of greater complexity in the driving signals. We propose and demonstrate a simple driving scheme for use with dual segment modulators that involves very little additional complexity when equal length segments are used. The increased bandwidth with segmentation scales linearly with the number of segments, but the net bit rate does not; net rate depends on many factors. With an IQ modulator with two 2 mm segments, we demonstrate an improvement of 14% in net bit rate as compared to a single 4 mm segment. We examine the trade-offs in moving to three-segment modulation. We explore implementation penalties and use probabilistic shaping and optical pre-emphasis to achieve a net rate of 1.07 Tb/s with dual polarization transmission over 80 km of fiber at 116 Gbaud using 64QAM modulation.
  • PublicationAccès libre
    Transmission of 120 Gbaud QAM with an all-silicon segmented modulator
    (Institute of Electrical and Electronics Engineers, 2022-06-08) Mohammadi, Abdolkhalegh; Jafari, Omid; Sepehrian, Hassan; Zheng, Zibo; Zhang, Xiaoguang; Shi, Wei; Rusch, Leslie
    Segmenting a silicon modulator can substantially increase its electro-optic bandwidth without sacrificing modulation efficiency. We demonstrate a segmented silicon IQ modulator and experimentally explore both modulator design and operating point to optimize systems trade-offs in coherent detection. An electro–optic bandwidth of greater than 40 GHz is measured for a 4-mm-long segment, and greater than 60 GHz for a 2-mmlong segment. We evaluate optical transmission experimentally at 120 Gbaud for 16-ary quadrature amplitude modulation (QAM) and 32QAM. The segments are operated in tandem with identical data at each segment. We present an experimental method to align data timing between the segments. Through the optimization of segment biasing and linear compensation, we have achieved a bit error rate (BER) of 16QAM well below the 20% forward error correction (FEC) threshold (2 × 10−2 ). Adding nonlinear pre-compensation allows for 32QAM with a BER below the 24% FEC threshold (4.5 × 10−2 ), enabling a net rate of 483 Gbs per polarization. The modulator can also be operated as an optical digital analogy converter for complex optical signal generation, for which 100 Gbs is achieved for a proof of concept.