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UID:20260526T025749EDT-2668O0i1I0@132.216.98.100
DTSTAMP:20260526T065749Z
DESCRIPTION:Abstract\n\nIn this thesis\, we explore several direct detect s
 ystem architectures and necessary digital signal processing (DSP) algorith
 m to either extend the transmission speed and reach or lower the cost and 
 complexity. This thesis can be divided into three parts. In the first part
 \, we focus on high throughput data transmission over 500 m to 2 km of sta
 ndard single-mode fiber (SSMF) enabled by Mach Zehnder modulators (MZMs). 
 Utilizing high order pulse amplitude modulation (PAM) format and linear an
 d nonlinear DSP algorithm\, we demonstrate a record net 300 Gbps/λ IM/DD t
 ransmission with an O-band silicon photonic (SiP) Mach-Zehnder modulator (
 MZM). Although SiP offer a large-scale\, low-cost solution\, further perfo
 rmance improvement is gated by the inherent bandwidth and phase shifting e
 fficiency limitations of these modulators. To push this capacity limit\, w
 e employ a TFLN MZM that enables net 350 Gbps/λ transmission with PAM8 sig
 naling.\n\nTransmission in the C-band with direct detection suffers from c
 hromatic dispersion (CD) induced power fading\, which limits the transmiss
 ion reach for high symbol rate signals. In the second part of the thesis\,
  we explore optical domain solutions to tackle this CD. We demonstrate the
  transmission of 60 Gbaud PAM-4 signal with polarization multiplexing (net
  224 Gbps) over 10 km of SSMF in the C-band using Stokes vector receiver a
 nd an integrated ring resonator based optical dispersion compensator (ODC)
 . We use a chirp free LiNbO3 MZM to test the performance of the ODC. As co
 mpared to externally modulated MZM\, directly modulated lasers (DML) show 
 strong frequency chirp but are attractive for their cost and power efficie
 ncy. We study the chirp-CD interaction of DML analytically over positive a
 nd negative dispersion regime and through extensive simulation show the be
 nefit and choice of optical filtering to enhance the transmission performa
 nce. As a next step\, we experimentally verify the advantages of optical f
 iltering in a DSP free DML/DD system and transmit 32 Gbps PAM4 signal over
  a CD range of -170 ps/nm to +340 ps/nm. With the aid of a proper optical 
 filter and optimized DSP\, we further extend the symbol rate to 35 Gbaud o
 ver 20 km of SSMF.\n\nIn the last part of the thesis\, we try to push the 
 transmission reach to 40 km in the C-band by adopting single-sideband (SSB
 ) scheme with MZM\, which is theoretically immune to power fading. However
 \, creating an ideal SSB signal is complex and costly\; and efficient solu
 tion is needed. We demonstrate that a skew between the differential drivin
 g signals in a dual-drive (DD) MZM based SSB transmitter can significantly
  relax the optical filtering requirement\, reducing the cost. This enables
  net 200 Gbps/λ signal transmission over 40 km with a second order super g
 aussian optical filter. Overall\, the proposed SSB scheme provides an inno
 vative solution to enable high speed data transmission over 40 km of SSMF 
 with direct detection in the C-band.\n
DTSTART:20230828T170000Z
DTEND:20230828T190000Z
LOCATION:Room 603\, McConnell Engineering Building\, CA\, QC\, Montreal\, H
 3A 0E9\, 3480 rue University
SUMMARY:PhD defence of Md Samiul Alam – Subsystems and Systems for Direct D
 etect Optical Fiber Transmission
URL:/ece/channels/event/phd-defence-md-samiul-alam-sub
 systems-and-systems-direct-detect-optical-fiber-transmission-350102
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