Abstract
We report here on the design, fabrication and characterization of 48-channel
parallel optical transceivers demonstrating terabit/sec data transfer rate. The 0.48
Tb/s transmit plus 0.48 Tb/s receive throughput was achieved using a second-generation
single-chip holey CMOS transceiver IC. In addition to 24 receiver (RX) and 24 laser
diode driver circuits, the 5.2 mm × 5.8 mm single CMOS chip incorporates 48
through-substrate optical vias (holes), one for each transmitter (TX) and RX channel. A
complete holey Optochip is formed following direct flip-chip attachment of 24-channel
850-nm VCSEL and PD arrays. The 48 optical vias enable optical access to the 24 VCSELs
and 24 PDs. The holey Optochip concept provides a dense chip-scale package which is
fully compatible with industry-standard top emitting/detecting 850-nm VCSELs/PDs
providing optimized high-speed performance through close integration of the
optoelectronic (OE) devices with their drive electronics. Furthermore, the optical vias
and OE devices are arranged in a 4 × 12 array on 250 µm × 250 µm
pitch to facilitate direct fiber-coupling to a standard 4 × 12 multi-mode fiber
array.The Optochips are packaged into complete modules by flip-chip soldering to
high-density, high-speed organic carriers. A pluggable connector soldered to the bottom
of the carrier provides all module electrical I/O. The 18 mm × 18 mm overall module
area is dictated by the 0.8 mm-pitch ball grid array (BGA) of the organic carrier and
connector. Fully functional holey Optomodules with 24 TX and 24 RX channels operate up
to 20 Gb/s/ch achieving efficiencies (including both TX and RX) of 7.3 pJ/bit. The
terabit/sec data rate (480 Gb/s TX + 480 Gb/s RX) is highest reported for single-chip
CMOS transceiver modules.
© 2012 IEEE
PDF Article
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