14 research outputs found
High performance silicon photonic devices based on practical metamaterials
Robert Halir, et al., "High performance silicon photonic devices based on practical metamaterials," OECC/PSC, 7-12 July 2019, Fukuoka (Japan)Subwavelength grating metamaterials are enabling a new generation of high-performance silicon photonic devices. Here we discuss the fundamental physics along with some of the latest advances in this rapidly expanding field.Universidad de Málaga. Campus de Excelencia Internacional AndalucÃa Tech.
Ministerio de EconomÃa y Competitividad, Programa Estatal de Investigación Orientada a los Retos de la Sociedad (cofinanciado FEDER) – TEC2016-80718-R, TEC2015-71127-C2-1-R (FPI BES-2016-077798) and IJCI-2016-30484; Community of Madrid – S2018/NMT-4326, Marie Sklodowska-Curie –734331, Czech Science Foundation – 1900062
Metamaterial engineered C+L band 90º hybrid with 150 nm feature size
90º hybrids are important components for coherent optical communications. Conventional
implementations only cover the C band, while broadband, metamaterial-based devices require sub-100nm feature sizes.
We propose a design based on dual-etch silicon subwavelength structures that achieves a 170 nm bandwidth with deep-UV
compatible feature sizes.Universidad de Málaga. Campus de Excelencia Internacional AndalucÃa Tech.
Ministerio de Universidades (FPU-16/03401)
Ministerio de EconomÃa y Competitividad FEDER (TEC2016-80718-R)
Programa Operativo FEDER AndalucÃa 2014-2020 (UMA18-FEDERJA-219
High-speed 4 4 silicon photonic electro-optic switch, operating at the 2 {\mu}m waveband
The escalating need for expansive data bandwidth, and the resulting capacity
constraints of the single mode fiber (SMF) have positioned the 2-m
waveband as a prospective window for emerging applications in optical
communication. This has initiated an ecosystem of silicon photonic components
in the region driven by CMOS compatibility, low cost, high efficiency and
potential for large-scale integration. In this study, we demonstrate a plasma
dispersive, 4 4 electro-optic switch operating at the 2-m
waveband with the shortest switching times. The demonstrated switch operates
across a 45-nm bandwidth, with 10-90% rise and 90-10% fall time of 1.78 ns and
3.02 ns respectively. In a 4 4 implementation, crosstalk below -15
dB and power consumption below 19.15 mW across all 16 ports are indicated. The
result brings high-speed optical switching to the portfolio of devices at the
promising waveband
Coherent WDM transmission using quantum-dash mode-locked laser diodes as multi-wavelength source and local oscillator
Quantum-dash (QD) mode-locked laser diodes (MLLD) lend themselves as
chip-scale frequency comb generators for highly scalable wavelength-division
multiplexing (WDM) links in future data-center, campus-area, or metropolitan
networks. Driven by a simple DC current, the devices generate flat broadband
frequency combs, containing tens of equidistant optical tones with line
spacings of tens of GHz. Here we show that QD-MLLDs can not only be used as
multi-wavelength light sources at a WDM transmitter, but also as
multi-wavelength local oscillators (LO) for parallel coherent reception. In our
experiments, we demonstrate transmission of an aggregate data rate of 4.1
Tbit/s (23x45 GBd PDM-QPSK) over 75 km standard single-mode fiber (SSMF). To
the best of our knowledge, this represents the first demonstration of a
coherent WDM link that relies on QD-MLLD both at the transmitter and the
receiver
Reconfigurable reflective arrayed waveguide grating using optimization algorithms
[EN] In this paper we report the experimental realization of a reconfigurable reflective arrayed waveguide grating on silicon nitride technology, using optimization algorithms borrowed from machine learning applications. A dozen of band-shape responses, as well as a spectral resolution change, are demonstrated in the optical telecom C-band, alongside a proof of operation of the same device in the O-band. In the context of programmable and reconfigurable integrated photonics, this building block supports multi-wavelength/band spectral shaping of optical signals that can serve to multiple applications.Ministerio de Economia y Competitividad (Industrial doctorate grant DI-15-08031, PID2019110877GB-I00 BHYSINPICS, TEC2016-80385-P SINXPECT); H2020 Marie Sklodowska-Curie Actions (Training Network MICROCOMB (GA 812818)); Generalitat Valenciana (PROMETEO/2017/103).Fernández, J.; Felip, J.; Gargallo, B.; Doménech, JD.; Pastor Abellán, D.; DomÃnguez-Horna, C.; Muñoz Muñoz, P. (2020). Reconfigurable reflective arrayed waveguide grating using optimization algorithms. Optics Express. 28(21):31446-31456. https://doi.org/10.1364/OE.404267S3144631456282
50 GBd PAM4 transmitter with a 55nm SiGe BiCMOS driver and silicon photonic segmented MZM
We demonstrate an optical transmitter consisting of a limiting SiGe BiCMOS driver co-designed and co-packaged with a silicon photonic segmented traveling-wave Mach-Zehnder modulator (MZM). The MZM is split into two traveling-wave segments to increase the bandwidth and to allow a 2-bit DAC functionality. Two limiting driver channels are used to drive these segments, allowing both NRZ and PAM4 signal generation in the optical domain. The voltage swing as well as the peaking of the driver output are tunable, hence the PAM4 signal levels can be tuned and possible bandwidth limitations of the MZM segments can be partially alleviated. Generation of 50 Gbaud and 53 Gbaud PAM4 yields a TDECQ of 2.8 and 3.8 dB with a power efficiency of 3.9 and 3.6 pJ/bit, respectively; this is the best reported efficiency for co-packaged silicon transmitters for short-reach datacenter interconnects at these data rates. With this work, we show the potential of limiting drivers and segmented traveling-wave modulators in 400G capable short-reach optical interconnects
Communications with guaranteed bandwidth and low latency using frequency-referenced multiplexing
Emerging cloud applications such as virtual reality and connected car fleets demand guaranteed connections, as well as low and stable latency, to edge data centres. Currently, user–cloud communications rely on time-scheduled data frames through tree-topology fibre networks, which are incapable of providing guaranteed connections with low or stable latency and cannot be scaled to a larger number of users. Here we show that a frequency-referenced multiplexing method can provide guaranteed bandwidth and low latency for time-critical applications. We use clock and optical frequency synchronization, enabled by frequency comb and signal processing techniques, to provide each user with dedicated optical bandwidth, creating scalable user–cloud upstream communications. As a proof of concept, we demonstrate a frequency-division multiplexing system servicing up to 64 users with an aggregate bandwidth of 160 GHz, exhibiting a data rate of up to 4.3 Gbps per user (240.0 Gbps aggregated capacity considering a 200 GHz wavelength band) with a high receiver sensitivity of –35 dBm
Transmission of 120 Gbaud QAM with an all-silicon segmented modulator
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
Coherent WDM transmission using quantum-dash mode-locked laser diodes as multi-wavelength source and local oscillator
Quantum-dash (QD) mode-locked laser diodes (MLLD) lend themselves as
chip-scale frequency comb generators for highly scalable wavelength-division
multiplexing (WDM) links in future data-center, campus-area, or metropolitan
networks. Driven by a simple DC current, the devices generate flat broadband
frequency combs, containing tens of equidistant optical tones with line
spacings of tens of GHz. Here we show that QD-MLLDs can not only be used as
multi-wavelength light sources at a WDM transmitter, but also as
multi-wavelength local oscillators (LO) for parallel coherent reception. In our
experiments, we demonstrate transmission of an aggregate data rate of 4.1
Tbit/s (23x45 GBd PDM-QPSK) over 75 km standard single-mode fiber (SSMF). To
the best of our knowledge, this represents the first demonstration of a
coherent WDM link that relies on QD-MLLD both at the transmitter and the
receiver