Analysis of optical rib self-imaging multimode interference (MMI) waveguide devices using the discrete spectral index method

“…Multiplying the above matrix by two values of a discrete signal gives sum and subtraction signals. An optical scheme having a same transfer matrix as (1) is illustrated in Fig 1 . This scheme consists of a 2×2 restricted interference multimode (RI-MMI) coupler (Soldano,Pennings 1995;Berry,Burke 1995;Latunde-Dada,Payne 2008;Leick et al 2001) with the length of L  along with two  phase shifters placed at its upper arms and can be used to implement 2-point 1st-order optical HT (Le 2010). L  is the beat length of two modes in the coupler with the lowest orders and obtained by (Soldano,Pennings 1995):…”

Section: Designmentioning

confidence: 99%

Realization of visible light integrated circuits for all-optical haar transform

2021

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Photonic integrated circuits have been designed, simulated and tested on TriPleX TM platform technology for implementing optical Haar Transform (HT) in the visible spectrum. Optical circuits contain the new building block (BB) designed using the multimode interference (MMI) structure performing optical HT on a pair of the optical signals. The Outputs of the BB demonstrates the sum and subtraction of the input signals according to the HT operation. 1st-order and 2nd-order optical HT achieved for the green light input signals. Simulation and experimental results have successfully validated designed photonic circuits capability in implementing optical HT.

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“…The operation principle of MMI is based on self-imaging theory and total internal reflection [6,[20][21][22][23][24][25][26][27][28][29]. Making use of the self-imaging principle involves exciting a set of guided modes in the multimode section by a fundamental mode from one of the input ports.…”

Section: Theoretical Foundationmentioning

confidence: 99%

2x4 Hybrid MZI-MMI Configuration with MMI Phase-shifters as a High-speed Optical Switch with Low Power Consumption

Niraula¹,

Rizal²

2019

Preprint

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This paper reports 2 × 4 hybrid Mach-zehnder interferometer (MZI) - multi-mode interferometers (MMI) based compact thermo-optical switch consisting of slab waveguides on silicon-on-insulator, SOI, platform. The device consists of two identical MMIs, each of 6 μm wide and 140 μm long connected with two phase shifters MMIs each with 2 μm wide and 8 μm long and linear tappers each 4 μm long, connected at both ends of the MMIs to minimize the power coupling loss. The loss for linear taper is found to be below 0.02dB. The footprint of the whole device is six 6 μm × 324 μm. This structure is based on unique multimode region shape, which leads optical switch to have less coupling loss and reduced cross-talk. The average thermo-optical switching power consumption is 1.4 mW, the excess losses are 0.8 dB, and the imbalances are 0.1 dB. Aluminum is used as a heating pad, and a trench is created around this pad to prevent from spreading of heat and reduce power loss almost by a factor of 2 to the adjacent phase shifter. Our new heating method has advantages of compact size and ease of fabrication with the current CMOS technology.

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Analysis of optical rib self-imaging multimode interference (MMI) waveguide devices using the discrete spectral index method

Cited by 13 publications

References 10 publications

Bending loss of InGaAs/InGaAsP vertical coupled photonic wire resonator

Bending loss of InGaAs/InGaAsP vertical coupled photonic wire resonator

Realization of visible light integrated circuits for all-optical haar transform

2x4 Hybrid MZI-MMI Configuration with MMI Phase-shifters as a High-speed Optical Switch with Low Power Consumption

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