Reduced reflections from multimode interference couplers

Hanfoug, R Rabah; Augustin, LM Luc; Barbarin, Y.; Tol, van der Jjgm Jos; Bente, Eajm Erwin; Karouta, F.; Rogers, D.; Cole, Spencer T.; Oei, YS Yok-Siang; Leijtens, X.J.M.; Smit, MK Meint

doi:10.1049/el:20064422

Cited by 36 publications

(17 citation statements)

References 5 publications

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“…These are the the regular rectangular layout, and the shape described in [6]. We refer to the first shape as 'Regular', and to the second as 'Cut'.…”

Section: Designmentioning

confidence: 99%

“…There may not be room for dummy waveguides, or reduced contrast may not be offered by the technology platform. In [6], the corners of the MMI were cut to reduce reflections. Here we take the MMI structure of [6] as a starting point, and add additional structures to reduce reflections.…”

Section: Introductionmentioning

confidence: 99%

“…In [6], the corners of the MMI were cut to reduce reflections. Here we take the MMI structure of [6] as a starting point, and add additional structures to reduce reflections. The approach we present can be used in any technology that offers designers to freely determine the waveguide shape in the plane.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Multimode Interference Couplers With Reduced Parasitic Reflections

Kleijn

Melati

Melloni

et al. 2014

IEEE Photon. Technol. Lett.

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Parasitic reflections can deteriorate the performance of a photonic integrated circuit. This is especially true in circuits containing amplifiers, but even in passive circuits, small reflections can already have a strong influence on circuit\ud performance. It is known that strong reflections can be present when using a 2 × 1 multimode interference coupler (MMI) as a combiner. We investigate methods for reducing these spurious reflections in a generic integration technology. We present a novel MMI shape whose measurements show reduced reflections by 17.5 dB

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“…These are the the regular rectangular layout, and the shape described in [6]. We refer to the first shape as 'Regular', and to the second as 'Cut'.…”

Section: Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multimode Interference Couplers With Reduced Parasitic Reflections

Kleijn

Melati

Melloni

et al. 2014

IEEE Photon. Technol. Lett.

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“…MMIs typically have associated insertion losses of 0.2 dB < and have been shown to have losses as low as 0.06 dB [9] at a wavelength of 1.55 m μ . Reflection losses also impact on MMI performance and are typically 40 dB ∼ − [10], however, can be reduced further using novel designs [11]. Although these losses are larger than what can be expected from using adiabatic tapers, the potential for reduced length phase shifters makes MMI based devices a good alternative for compact devices.…”

Section: Introductionmentioning

confidence: 99%

Multimode interference couplers as compact and robust static optical phase shifters

Morrissey¹,

Peters

2015

Optics Communications

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“…Moreover, to improve the image quality of multimode waveguide and reduce the reflection in the transmission direction, an optimized right-angled waveguide at one corner is cut. 22 With this principle and optimized structure, the present PBS has advantages of compact size, broad optical bandwidth, and simple structure. To fabricate it, we only need one-mask lithography on the SOI platform, which will greatly alleviate the fabrication requirement.…”

Section: Introductionmentioning

confidence: 99%

Compact polarization beam splitter for silicon-based slot waveguides based on an asymmetrical multimode interference coupler

Xu¹,

Xiao²,

Sun³

2015

SPIE Proceedings

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A compact polarization beam splitter (PBS) for silicon-based slot waveguides is proposed based on a multimode interference coupler, where an asymmetrical multimode waveguide (AMW), cut by a right angle at one corner, is employed to efficiently separate the TE and TM modes. With the unique modal properties of the slot waveguides and corresponding optimized designs, the input TE mode can almost pass through the AMW and then enter into the bar port, while a mirror image is formed at the cross port for the input TM mode due to the self-imaging effect. Meanwhile, tapered waveguide structures and S-bend are incorporated into the designed PBS for further enhancing the performance. According to the numerical results, a PBS with an AMW of 2.3 μm in length is achieved, where the extinction ratios are 16.6 and 20.9 dB, respectively, for TE and TM modes, and the insertion losses are 1.37 and 0.81 dB, respectively, at the wavelength of 1.55 μm. For keeping extinction ratios over 15 and 20 dB for TE and TM modes, the bandwidths are around 59 and 73 nm, respectively, both covering the entire C-band. In addition, field evolution along the propagation distance through the PBS is also demonstrated.

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Reduced reflections from multimode interference couplers

Cited by 36 publications

References 5 publications

Multimode Interference Couplers With Reduced Parasitic Reflections

Multimode Interference Couplers With Reduced Parasitic Reflections

Multimode interference couplers as compact and robust static optical phase shifters

Compact polarization beam splitter for silicon-based slot waveguides based on an asymmetrical multimode interference coupler

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