A novel design proposal to minimize reflections in deep-ridge multimode interference couplers

Gottesman, Yaneck; Rao, E. V. K.; Dagens, B.

doi:10.1109/68.896341

Cited by 20 publications

(5 citation statements)

References 3 publications

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“…This reflection process can be highly efficient due to the imaging properties of the MMI [2]- [4]. Previous attempts to reduce the reflection level of 2×1 MMI combiners used lossy waveguides [2], or reduced contrast access waveguides [5]. However, in some technologies these approaches may not work.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

“…In this letter we discus a new geometry to suppress parasitic reflections in MMI couplers. We will focus on 1 × 2 MMIs, as they are known to be especially liable to generate reflections when used as combiners [2].…”

Section: Introductionmentioning

confidence: 99%

Multimode Interference Couplers With Reduced Parasitic Reflections

Kleijn

Melati

Melloni

et al. 2014

IEEE Photon. Technol. Lett.

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“…In particular, the backreflections of conventional MMIs should be avoided in devices consisting of a semiconductor optical amplifier (SOA) and/or a distributed feedback laser diode (DFB-LD). Recently, several groups have reported reflection properties of deep-ridge MMIs using optical low coherence reflectometry (OLCR) [16][17][18][19]. However, there are few reports on quantitative studies of reflection.…”

Section: Introductionmentioning

confidence: 99%

Improvement of the dynamic input power range in a 10 Gb s⁻¹all-optical Mach–Zehnder interferometric wavelength converter module with monolithically integrated SOA preamplifiers and tapered-edge multimode interference couplers

Kim

Sim

Kim

et al. 2006

Semicond. Sci. Technol.

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All-optical wavelength conversion at 10 Gb s −1 is demonstrated in a Mach-Zehnder interferometric wavelength converter (MZI-WC) module with monolithically integrated SOA preamplifiers and tapered-edge multimode interference couplers (TMMIs). A conventional buried-type 1 × 2 MMI coupler exhibits a minimal excess loss of 0.43 dB and a reflectivity of 5.1 × 10 −4 (L MMI = 172 µm, W MMI = 12 µm). We adapt the 1 × 2 TMMI in the MZI-WC to improve back-reflection and poor uniformity, which is a major problem of conventional MMI and Y-branch. A good performance of the MZI-WC monolithically integrated with TMMI and SOA preamplifiers at 10 Gb s −1 is obtained with clear eye patterns, and a power penalty below 1.5 dB at a 10 −9 bit error rate over the whole C band (45 nm span) is obtained. The dynamic input power range is enhanced up to 11.3 dB by adjusting only the injection current of the SOA preamplifier.

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“…1) However, back-reflection usually exists in the rectangular MMI couplers. [2][3][4][5] The back-reflection is undesirable in integrated optics, because it would often affect other components, especially when the combiner is connected with the devices sensitive to light injection such as semiconductor optical amplifiers (SOAs). The backreflection in a 2 Â 2 rectangular MMI splitter has been experimentally investigated to be about À20 dB.…”

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confidence: 99%

“…In order to minimize the back-reflection, several proposals were reported. 5,7) We previously proposed a novel tapered MMI combiner to avoid the back-reflection. 8) In the tapered MMI combiner with out-of-phase inputs, only odd-modes are excited.…”

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confidence: 99%

Implementation of Tapered Multimode Interference Lightwave Combiner on Silicon-on-Insulator Substrate with Negligible Back-Reflection

Wu¹,

Nakamura²,

Honda³

et al. 2005

Jpn. J. Appl. Phys.

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We fabricated and experimentally evaluated 2×1 tapered multimode interference (MMI) combiners on silicon-on-insulator (SOI) substrates. The tapered MMI combiner we previously proposed is expected to be free from the reflection problem usually existed in a conventional rectangular MMI coupler, and such a negligible back-reflection property was actually verified. As one of its applications, we implemented a Mach–Zehnder (MZ) modulator using the tapered MMI combiner, which is often equipped with semiconductor optical amplifiers (SOAs) for ultrahigh-speed photonic switching devices and those SOAs are quite sensitive to the back-reflection.

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A novel design proposal to minimize reflections in deep-ridge multimode interference couplers

Cited by 20 publications

References 3 publications

Multimode Interference Couplers With Reduced Parasitic Reflections

Multimode Interference Couplers With Reduced Parasitic Reflections

Improvement of the dynamic input power range in a 10 Gb s⁻¹all-optical Mach–Zehnder interferometric wavelength converter module with monolithically integrated SOA preamplifiers and tapered-edge multimode interference couplers

Implementation of Tapered Multimode Interference Lightwave Combiner on Silicon-on-Insulator Substrate with Negligible Back-Reflection

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A novel design proposal to minimize reflections in deep-ridge multimode interference couplers

Cited by 20 publications

References 3 publications

Multimode Interference Couplers With Reduced Parasitic Reflections

Multimode Interference Couplers With Reduced Parasitic Reflections

Improvement of the dynamic input power range in a 10 Gb s−1all-optical Mach–Zehnder interferometric wavelength converter module with monolithically integrated SOA preamplifiers and tapered-edge multimode interference couplers

Implementation of Tapered Multimode Interference Lightwave Combiner on Silicon-on-Insulator Substrate with Negligible Back-Reflection

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Improvement of the dynamic input power range in a 10 Gb s⁻¹all-optical Mach–Zehnder interferometric wavelength converter module with monolithically integrated SOA preamplifiers and tapered-edge multimode interference couplers