Concept, design and verification of components for an integrated on-detector silicon photonic multichannel transmitter

AbstractGraphene has been widely used in silicon-based optical modulators for its ultra-broadband light absorption and ultrafast optoelectronic response. By incorporating graphene and slow-light silicon photonic crystal waveguide (PhCW), here we propose and experimentally demonstrate a unique double-layer graphene electro-absorption modulator in telecommunication applications. The modulator exhibits a modulation depth of 0.5 dB/μm with a bandwidth of 13.6 GHz, while graphene coverage length is only 1.2 μm in simulations. We also fabricated the graphene modulator on silicon platform, and the device achieved a modulation bandwidth at 12 GHz. The proposed graphene-PhCW modulator may have potentials in the applications of on-chip interconnections.

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Polarization-transparent silicon photonic add-drop multiplexer with wideband hitless tuneability

Nature Communications ◽

10.1038/s41467-021-24640-5 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Francesco Morichetti ◽

Maziyar Milanizadeh ◽

Matteo Petrini ◽

Francesco Zanetto ◽

Giorgio Ferrari ◽

...

Keyword(s):

Optical Networks ◽

Communication Networks ◽

Bandwidth Allocation ◽

Core Networks ◽

Reconfigurable Devices ◽

Silicon Photonic ◽

Transmission Quality ◽

And Control ◽

Integrated Device ◽

Dynamic Bandwidth

AbstractFlexible optical networks require reconfigurable devices with operation on a wavelength range of several tens of nanometers, hitless tuneability (i.e. transparency to other channels during reconfiguration), and polarization independence. All these requirements have not been achieved yet in a single photonic integrated device and this is the reason why the potential of integrated photonics is still largely unexploited in the nodes of optical communication networks. Here we report on a fully-reconfigurable add-drop silicon photonic filter, which can be tuned well beyond the extended C-band (almost 100 nm) in a complete hitless (>35 dB channel isolation) and polarization transparent (1.2 dB polarization dependent loss) way. This achievement is the result of blended strategies applied to the design, calibration, tuning and control of the device. Transmission quality assessment on dual polarization 100 Gbit/s (QPSK) and 200 Gbit/s (16-QAM) signals demonstrates the suitability for dynamic bandwidth allocation in core networks, backhaul networks, intra- and inter-datacenter interconnects.

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A modular design method based on TRIZ and AD and its application to cutter changing robot

Advances in Mechanical Engineering ◽

10.1177/16878140211034369 ◽

2021 ◽

Vol 13 (7) ◽

pp. 168781402110343

Author(s):

Mei Yang ◽

Yimin Xia ◽

Lianhui Jia ◽

Dujuan Wang ◽

Zhiyong Ji

Keyword(s):

Modular Design ◽

Design Method ◽

Idea Generation ◽

Design Parameters ◽

Problem Analysis ◽

Concept Design ◽

Functional Requirements ◽

Shield Tunneling ◽

Structural Hierarchy ◽

And Performance

Modular design, Axiomatic design (AD) and Theory of inventive problem solving (TRIZ) have been increasingly popularized in concept design of modern mechanical product. Each method has their own advantages and drawbacks. The benefit of modular design is reducing the product design period, and AD has the capability of problem analysis, while TRIZ’s expertise is innovative idea generation. According to the complementarity of these three approaches, an innovative and systematic methodology is proposed to design big complex mechanical system. Firstly, the module partition is executed based on scenario decomposition. Then, the behavior attributes of modules are listed to find the design contradiction, including motion form, spatial constraints, and performance requirements. TRIZ tools are employed to deal with the contradictions between behavior attributes. The decomposition and mapping of functional requirements and design parameters are carried out to construct the structural hierarchy of each module. Then, modules are integrated considering the connections between each other. Finally, the operation steps in application scenario are designed in temporal and spatial dimensions. Design of cutter changing robot for shield tunneling machine is taken as an example to validate the feasibility and effectiveness of the proposed method.

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