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High-Efficiency Two-Dimensional Perfectly Vertical Grating Coupler With Ultra-Low Polarization Dependent Loss and Large Fibre Misalignment Tolerance

A two-dimensional grating coupler (2D GC) with four access waveguides is proposed and demonstrated for polarization independent and perfectly vertical coupling. Benefitting from the perfectly vertical coupling and $1\times 4$ power splitting/combing scheme, broadband polarization independent operation can be achieved. Through grating apodization with etched square holes, a simulated coupling efficiency (CE) of 65% (−1.87 dB) is obtained with a minimum feature size of 180nm which is compatible with the 193-nm deep UV lithography technology. To characterize the device performance, a back-to-back configuration of this 2D GC was fabricated, where phase-delay lines with similar patterns are introduced to ensure the phase equality between different waveguide arms. A CE of 49% (−3.1 dB) was experimentally measured, with a 1-dB bandwidth of 42 nm and PDL below 0.2 dB across the wavelength range from $1.5~\mu \text{m}$ to $1.6~\mu \text{m}$ . The fibre misalignment tolerance of this device was also investigated by measurement. The excess coupling loss and PDL caused by $\pm 2~\mu \text{m}$ fibre misalignment are lower than 1 dB and 0.8 dB respectively, and the maximum excess coupling loss and PDL caused by ±2° fibre angle error is 1 dB and 0.7 dB respectively. Finally, optical modulation using this device is preliminarily demonstrated by the embedded thermal-optic functions.

Ketersediaan

Informasi Detail

Judul Seri

IEEE JOURNAL OF QUANTUM ELECTRONICS; Vol.57 No.5 October 2021

No. Panggil

-

Penerbit

: .,

Deskripsi Fisik

p. 8400407

Bahasa

English

ISBN/ISSN

-

Klasifikasi

NONE

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

TWO-DIMENSIONAL GRATING COUPLER
LOW POLARIZATION DEPENDENT LOSS
PERFECTLY VERTICAL GRATING COUPLER

Info Detail Spesifik

DOI: 10.1109/JQE.2021.3095289

Pernyataan Tanggungjawab

Zanyun Zhang, Kaixin Zhang, Qian Cheng, Meixin Li, Tianjun Liu, Beiju Huang, Zan Zhang, Hongwei Liu, Hongqiang Li, Pingjuan Niu, Hongda Chen

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