Dr. Jiajing Tu Profile

Dr. Jiajing Tu

at Univ of Science and Technology Beijing

SPIE Involvement:

Author

Publications (4)

Proceedings Article | 5 November 2018 Paper

Vital signs monitoring using few-mode fiber-based sensors

Shuyang Chen, Zhenyu Huang, Fengze Tan, Tianyu Yang, Jiajing Tu, Changyuan Yu

Proceedings Volume 10814, 108140P (2018) https://doi.org/10.1117/12.2504819

KEYWORDS: Vital signs, Interferometers, Single mode fibers, Sensors, Fiber optics sensors, Signal detection, Refractive index, Signal attenuation, Structured optical fibers, Fiber optics

Read Abstract +

SPIE Journal Paper | 31 October 2017

100-Gb/s 80-km transmission of PIM-SSB-OFDM at C-band using a single-end photodetector

Jiahao Huo, Xian Zhou, Kangping Zhong, Tao Gui, Fengze Tan, Jiajing Tu, Jinhui Yuan, Hongyu Zhang, Keping Long, Changyuan Yu, Alan Pak Tao Lau, Chao Lu

OE, Vol. 56, Issue 10, 106116, (October 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.10.106116

KEYWORDS: Orthogonal frequency division multiplexing, Polarization, Signal detection, Digital signal processing, Photodetectors, Modulation, Single sideband modulation, Modulators, Receivers, Optical engineering

Read Abstract +

Proceedings Article | 28 February 2017 Paper

Optimized design method for trench-assisted grade-index ring-core fiber with low DMD and large Aeff

Xihui Qiao, Jiajing Tu, Keping Long

Proceedings Volume 10256, 1025632 (2017) https://doi.org/10.1117/12.2257787

KEYWORDS: Digital micromirror devices, Refractive index, Digital signal processing, Signal processing, Multiplexing, Space division multiplexing, Fiber optic communications, Receivers, Cladding

Read Abstract +

Proceedings Article | 28 February 2017 Paper

The design of fiber-based 4-LP mode multi/demultiplexer

Huan Zhang, Jiajing Tu, Keping Long

Proceedings Volume 10256, 102563M (2017) https://doi.org/10.1117/12.2257833

KEYWORDS: Structured optical fibers, Refractive index, Multiplexing, Optical fibers, Structural design

Read Abstract +

We propose a fiber-based 4-LP mode (LP₀₁, LP₁₁, LP₂₁ and LP₀₂) multi/demultiplexer, which excites or separates 4-LP mode simultaneously in the integrated structure of a single optical fiber. The structure contains a 4-mode transmitting core in the center of the fiber and the other three multi/demulitplexing parts (consist of a coupling core and several assistant cores or not) which are deployed around the transmitting core with 120 degrees between each other.

The design of the fiber-based 4-LP mode multi/demultiplexer includes the following parts. Firstly, the appropriate distance between the transmitting core and the surrounding parts are below 15μm, 12μm and 10μm for multi/demultiplexing of LP₁₁, LP₂₁ and LP₀₂ mode, respectively, which can guarantee the coupling loss is less than 2%. Then we design the structural parameters (core diameter and refractive index) of single-mode coupling cores to achieve phase matching between LP₀₁ (single-mode coupling cores) and LP₁₁, LP₂₁, LP₀₂ (transmitting core), respectively. The appropriate core diameter and refractive index for the coupling cores of the multi/demultiplexing parts are 5μm and 1.465703 (LP₀₁-LP₁₁), 2μm and 1.479793 (LP₀₁-LP₂₁), 1.5μm and 1.488404 (LP₀₁-LP₀₂), respectively, all of which can ensure that the coupling efficiency are more than 90% in the C+L band. Afterwards, by discussing the coupling crosstalk of each multi/demultiplexing part, we find that LP₀₂-LP₀₁ mode multi/demultiplexing part does not need any assistant core, LP₂₁-LP₀₁ and LP₁₁-LP₀₁ mode multi/multiplexing parts need to add 1 or 2 assistant single mode core as required to decrease the coupling crosstalk. Finally by adjusting the relative position of the three multi/demultiplexing parts and the transmitting core (ensure the performance of the whole system is not affected), we can ensure that the 4 mode can be multi/demultiplexed at the same time.

Above all, we put forward a fiber-based 4-LP-mode multi/demultiplexer which excites or separates 4-LP mode simultaneously with high multi/demultiplexing efficiency, low coupling loss, and low coupling crosstalk.

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years