Study On Optical Communications, Volume. 49, Issue 3, 53(2023)
Research and Design of 1×4 Multimode Interference Coupler with High Uniformity
Figures & Tables(11)
Fig. 1. Schematic diagram of the structure of a common MMI coupler and mode distribution in the multimode region
Fig. 2. Variation of total output optical power P of MMI with WMMI=8 and 10 μm with the length of multimode waveguide LMMI
Fig. 3. Structure of 1×4 MMI coupler and its optical field distribution
Fig. 4. Scanning results of related parameters of 1×4 MMI coupler with WMMI=8 μm after changing the width of 2 and 3-port tapered waveguides
Fig. 5. Scanning results of related parameters of 1×4 MMI coupler with WMMI=10 μm after changing the width of 2 and 3-port tapered waveguides
Fig. 6. Insertion loss loss and uniformity UF obtained by scanning the length of the tapered waveguide of the 1×4 MMI coupler with WMMI=8 and 10 μm
Table 1. Laws of the three interference mechanisms
View tableView in ArticleTable 1. Laws of the three interference mechanisms
干涉机制 普通干涉 配对干涉 对称干涉 输入×输出 N×N 2×N 1×N 第1个单一映像出现的位置 3Lπ Lπ 3Lπ/4 第1个N重映像出现的位置 3Lπ/N Lπ/N 3Lπ/(4N) 限制条件 / Cν=0 Cν=0 ν=2,5,8, … ν=1,3,5, … 输入位置Y 任意位置 Y=±We/6 Y=0
Table 2. Basic structural parameters of 1×4 MMI coupler
View tableView in ArticleTable 2. Basic structural parameters of 1×4 MMI coupler
WMMI/μm LMMI/μm gap/μm Ltaper/μm WWG/μm Wtaper/μm 8 27.65 1.00 10 0.5 1.50 10 43.50 1.25 10 0.5 1.82
Table 3. Structural parameters of the optimized unequal width 1×4 MMI coupler
View tableView in ArticleTable 3. Structural parameters of the optimized unequal width 1×4 MMI coupler
WMMI/μm LMMI/μm gap/μm Ltaper/μm WWG/μm Wtaper(1,4)/μm Wtaper(2,3)/μm 8 27.65 1.00 10 0.5 1.50 1.46 10 43.50 1.25 10 0.5 1.82 1.77
Table 4. Performance comparison results of MMI couplers based on unequal width design
View tableView in ArticleTable 4. Performance comparison results of MMI couplers based on unequal width design
WMMI/μm Wtaper(1,4)/μm Wtaper (2,3)/μm 平均UF/dB 平均loss/dB 8 1.50 1.40 0.023 77 0.079 47 8 1.50 1.46 0.010 82 0.068 06 8 1.50 1.50 0.025 49 0.062 55 10 1.82 1.70 0.013 33 0.066 59 10 1.82 1.78 0.007 44 0.057 81 10 1.82 1.82 0.013 88 0.055 41
Table 5. Comparison of parameters of MMI coupler with different structures
View tableView in ArticleTable 5. Comparison of parameters of MMI coupler with different structures
文献 尺寸(WMMI×LMMI)/μm2 loss/dB UF/dB [ 8 ]60.00×2 089.0 0.101 0 0.102 0 [ 10 ]28.00×436.5 0.087 0 0.028 5 [ 11 ]80.82×1 287.6 0.031 0 0.072 0 本文器件 10.00×43.5 0.057 8 0.007 0
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Zhao-yi LI, Zuo-wen FAN, Qing-yu CONG, Jing-jie ZHOU, Xian-feng ZENG, Shao-nan ZHENG, Yuan DONG, Ting HU, Qi-ze ZHONG, Lian-xi JIA. Research and Design of 1×4 Multimode Interference Coupler with High Uniformity[J]. Study On Optical Communications, 2023, 49(3): 53
Paper Information
Category: Research Articles
Received: Jul. 18, 2022
Accepted: --
Published Online: Jun. 12, 2023
The Author Email: Lian-xi JIA (jialx@mail.sim.ac.cn)
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