Low-Loss and Compact Silicon Rib Waveguide Bends

Brimont, A.; Hu, Xuan; Cueff, Sébastien; Romeo, Pédro Rojo; Girons, G. Saint; Griol, Amadeu; Zanzi, Andrea; Sanchís, Pablo; Orobtchouk, Régis

doi:10.1109/lpt.2015.2495230

Cited by 11 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Bend losses as a function of bend radius, for core diameters of 1.5 and 2 µm, with a fin height/width of 1.5/0.3 µm, are shown in Figure 4b, with insets showing the mode supported by the bent waveguide (evaluated using mode solving). As expected, bending losses increased substantially at small bend radii (below 10 µm); however, the low losses did not reduce to negligible values for large bend radii, suggesting a leakage path to the substrate [26]. To verify this, we evaluated the same bend losses without the presence of the nano-fin (but with the substrate) and observed lower losses with monotonic decay, demonstrating that the nano-fin provides a leakage path at waveguide bends.…”

Section: Bending Lossmentioning

confidence: 57%

Single Mode, Air-Cladded Optical Waveguides Supported by a Nano-Fin Fabricated with Direct Laser Writing

Gill

Marom

2021

Applied Sciences

View full text Add to dashboard Cite

Single-mode, air-cladded optical waveguides have wavelength scale diameters, making them very fragile and difficult to handle and yet highly desirable for sensing and inter-chip photonic interconnects. These contradictory qualities are resolved in this work by supporting the optical waveguide with a nano-fin structure attached to a substrate, narrow enough and sufficiently tall to minimally impact the wave-guiding metrics of the solid core while providing structural mechanical integrity. The design considerations for the nano-fin-supported waveguide and its realization using a commercial direct laser writing system based on two-photon activation of a photopolymer is reported herein. The 3D printed waveguides are characterized and experimentally assessed, demonstrating low birefringence and an estimated propagation loss for LP01x and LP01y of 2.9 dB/mm and 3.4 dB/mm, respectively, attributed to surface roughness and the relatively high refractive index contrast with air.

show abstract

Section: Bending Lossmentioning

confidence: 57%

Single Mode, Air-Cladded Optical Waveguides Supported by a Nano-Fin Fabricated with Direct Laser Writing

Gill

Marom

2021

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…We can then extract that the Fano parameter (q) and the loss of the hybrid waveguide structure are 0.21 and 9.7 dB cm −1 respectively. We hypothesize that this increased loss is primarily from enhanced bending losses due to slab leakage loss in the GaS (see supporting information (available online at stacks.iop.org/JOPT/23/025802/mmedia)) [39]. This bending loss may be remedied in the future by using thinner GaS, or larger microring resonators.…”

Section: Resultsmentioning

confidence: 99%

Enhancing SiN waveguide optical nonlinearity via hybrid GaS integration

Deckoff-Jones

Pelgrin

Zhang

et al. 2021

J. Opt.

View full text Add to dashboard Cite

Silicon nitride (SiN) has been demonstrated as an exceptional low-loss platform for integrated photonics, however, its relatively small nonlinear refractive index limits its full potential in applications such as all-optical phase modulation, supercontinuum generation, and frequency combs. Here, we demonstrate that through hybrid integration with wide-bandgap 2D materials such as gallium sulfide (GaS), the nonlinear refractive index of the hybrid waveguide can be greatly increased (by five-fold in our experiment). We fabricate high quality factor SiN/GaS microring resonators, with low two-photon absorption at telecom wavelengths, to demonstrate enhanced all-optical modulation. We show that the hybrid platform is suitable for assessing the nonlinear properties of 2D materials, and we have used it to quantify, for the first time, the nonlinear refractive index (n 2) of GaS. For GaS, n 2 = 12 × 10 − 19 m 2 W − 1 , which is ten times larger than that of SiN.

show abstract

“…Additionally, any variation in the waveguide mode in the ring compared to that in a straight waveguide is unaccounted for in the simulation. This effect can shift the modal power distribution in the waveguide and thus the optimal p-n junction offset value [24].…”

Section: Resultsmentioning

confidence: 99%

Experimental quantification of the free-carrier effect in silicon waveguides at extended wavelengths

Hagan¹,

Nedeljkovic²,

Cao³

et al. 2019

Opt. Express

View full text Add to dashboard Cite

We examine the electro-optic effect at wavelengths ranging from 1.31 to 2.02 µm for: (1) an Electronic Variable Optical Attenuator (EVOA); and (2) a Micro-Ring Resonator (MRR). For the EVOA, simulations were performed to ascertain the relationship between free-carrier concentration and optical attenuation, and are in agreement with our observation of an increase in attenuation with increasing wavelength. MRRs were fabricated for use around wavelengths of 2 µm to explore the sensitivity of operation to bus-to-ring coupling gap and p-n junction offset. Trends observed in the experiment are replicated by simulation, calibrated using the observations of the EVOA operation. The previously proposed efficiency increase of operation around 2 µm compared to more traditional wavelengths is demonstrated. Future development of devices for these wavelengths, supported by amplification using Thulium Doped Fiber Amplifier (TDFA) technology, is a promising route to aid in the alleviation of increasing demands on communication networks.

show abstract

Low-Loss and Compact Silicon Rib Waveguide Bends

Cited by 11 publications

References 13 publications

Single Mode, Air-Cladded Optical Waveguides Supported by a Nano-Fin Fabricated with Direct Laser Writing

Single Mode, Air-Cladded Optical Waveguides Supported by a Nano-Fin Fabricated with Direct Laser Writing

Enhancing SiN waveguide optical nonlinearity via hybrid GaS integration

Experimental quantification of the free-carrier effect in silicon waveguides at extended wavelengths

Contact Info

Product

Resources

About