Five-port optical router for photonic networks-on-chip
ABSTRACT We experimentally demonstrate a spatially non-blocking five-port optical router, which is based on microring resonators tuned through the thermo-optic effect. The characteristics of the microring-resonator-based switching element are investigated to achieve balanced performances in its two output ports. The optical router is fabricated on the SOI platform using standard CMOS processing. The effective footprint of the device is about 440×660 μm2. The microring resonators have 3-dB bandwidths of larger than 0.31 nm (38 GHz), and extinction ratios of better than 21 dB for through ports and 16 dB for drop ports. Finally, 12.5 Gbps high-speed signal transmission experiments verify the routing functionality of the optical router.
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ABSTRACT: We report a carrier-depletion silicon Mach–Zehnder optical modulator with large optical bandwidth by adopting two symmetric arms. The fiber-to-fiber loss of the device is about 7.2–8 dB in the wavelength range from 1525 to 1565 nm. We have used the truncation method to accurately measure the loss of the optical splitter and combiner, and the on-chip loss is about 3.8 dB. The dynamic extinction ratios at the speed of 40 Gb/s are 4.9–6.4 dB in the wavelength range from 1529 to 1565 nm. By analyzing the dependence of the optical bandwidth on the optical path difference between the two arms, we find that there is an unexpected optical path difference of around 3.3 μm between the two arms, which is considered to originate from the nonuniform morphologies of the waveguide and the nonuniform doping profiles along the two arms and is responsible for the slight wavelength dependence of the static and dynamic response of the silicon Mach–Zehnder optical modulator.Journal of Lightwave Technology 03/2014; 32(5). DOI:10.1109/JLT.2013.2295401 · 2.86 Impact Factor
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ABSTRACT: We have fabricated a wavelength-insensitive silica/polymer total-internal-reflection thermooptic switch element using photolithography and wet etching techniques. A switching power of 70 mW is required to drop the crosstalk below −20 dB. Under through and reflection states, the propagation losses of the 0.47-cm long core switch element are measured to be 1.8 and 3.6 dB, respectively. The 10%–90% rise time and the 90%–10% fall time are 0.35/0.38 and 0.52 ms, respectively. Using 11 switch elements, we have proposed a nonblocking four-port optical router. The propagation loss range is $sim 5.4$ –23.4 dB along all routing paths. Both the switch and the router show potential applications of wideband signal switching and routing in multiprocessor-based optical networks-on-chip.IEEE Photonics Technology Letters 03/2015; 27(6):581-584. DOI:10.1109/LPT.2014.2385733 · 2.18 Impact Factor
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ABSTRACT: An optical network-on-chip (NoC) has attracted increasing attention with the advancement of silicon photonics technology due to the explosive growth in communication traffic in system-on-chip and the diminishing returns of miniaturized metal interconnect. Compared with the traditional metallic interconnect, the optical interconnect has superior effective bandwidth, transmission latency, and power consumption. In this paper, we establish an algorithmic optical router design framework to minimize the insertion loss, which is the loss of signal power resulting from the insertion of microring resonators and waveguide crossings. By incorporating system-level considerations on the topology, routing algorithm, and traffic pattern in the optical NoC, the proposed technique provides a rapid design environment for a wide range of application-specific optical NoC architectures with minimized optical signal power loss.Journal of Lightwave Technology 09/2014; 32(18). DOI:10.1109/JLT.2014.2336234 · 2.86 Impact Factor