Sensitive determination of the existence of higher-order modes in a quasi-single-mode fiber

1986 ◽  
Vol 11 (12) ◽  
pp. 815
Author(s):  
Y. Nakajima ◽  
S. Ezekiel
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Higher Order ◽  
Higher Order Modes ◽  
Sensitive Determination

scholarly journals Design of large mode area all-solid anti-resonant fiber for high-power lasers

2021 ◽  
Vol 9 ◽  
Author(s):  
Xin Zhang ◽  
Shoufei Gao ◽  
Yingying Wang ◽  
Wei Ding ◽  
Pu Wang
Keyword(s):  
High Power ◽  
Single Mode ◽  
Higher Order ◽  
Coupling Scheme ◽  
Resonant Coupling ◽  
Higher Order Modes ◽  
Mode Loss ◽  
Fiber Mode ◽  
Power Needs ◽  
Mode Area

Abstract High-power fiber lasers have experienced a dramatic development over the last decade. Further increasing the output power needs an upscaling of the fiber mode area, while maintaining a single-mode output. Here, we propose an all-solid anti-resonant fiber (ARF) structure, which ensures single-mode operation in broadband by resonantly coupling higher-order modes into the cladding. A series of fibers with core sizes ranging from 40 to 100 μm are proposed exhibiting maximum mode area exceeding 5000 μm2. Numerical simulations show this resonant coupling scheme provides a higher-order mode (mainly TE01, TM01, and HE21) suppression ratio of more than 20 dB, while keeping the fundamental mode loss lower than 1 dB/m. The proposed structure also exhibits high tolerance for core index depression.

scholarly journals Influence of Even-Order Dispersion on Super-Sech Soliton Transmission Quality under Coherent Crosstalk

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
Aleksandra Panajotovic ◽  
Daniela Milovic ◽  
Anjan Biswas ◽  
Essaid Zerrad
Keyword(s):  
Fourth Order ◽  
Optical Network ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Higher Order ◽  
Trailing Edges ◽  
Even Order ◽  
Transmission Quality ◽  
The Impact ◽  
Order Dispersion

The transmission speed of optical network strongly depends on the impact of higher order dispersion. In presence of coherent crosstalk, which cannot be otherwise controlled by optical filtering, the impact of higher order dispersions becomes more pronounced. In this paper, the general expressions, that describe pulse deformation due to second- and fourth-order dispersions in a single-mode fiber, are given. The responses for such even-order dispersions, in presence of coherent crosstalk, are characterized by waveforms with long trailing edges. The transmission quality of optical pulses, due to both individual and combined influence of second- and fourth-order dispersions, is studied in this paper. Finally, the pulse shape and eye diagrams are obtained.

Employing higher order modes in a broadband SIW sensor for permittivity measurement of medium loss materials

2020 ◽  
pp. 1-13
Author(s):  
Kianoosh Kazemi ◽  
Gholamreza Moradi ◽  
Ayaz Ghorbani
Keyword(s):  
Dielectric Properties ◽  
Photonic Band Gap ◽  
Perturbation Technique ◽  
Microfluidic Channel ◽  
Higher Order ◽  
Permittivity Measurement ◽  
Higher Order Modes ◽  
Microwave Sensor ◽  
Photonic Band

Abstract In this paper, a novel SIW microwave sensor is designed to accurately determine the broadband complex permittivity of medium loss and dispersive liquids using a number of higher order modes in 11–20 GHz. To achieve a higher accuracy in characterization, the sensor is equipped with some methods such as Photonic Band Gap method, slow-wave via, and a new feedline, which enhances the quality factor for the higher order TE1,0,n modes. The operating principle of this sensor is based on the cavity perturbation technique, in which the resonant properties of the cavity are utilized to extract the dielectric properties of liquid under test. To provide a method to decrease the LUT consumption, a winding microfluidic channel is designed and embedded in the cavity. The channel increases the interaction between the induced electric field and the LUT. The accuracy of different perturbation technique for determination of permittivity is compared with each other.

Highly efficient higher-order modes filtering into aperiodic very large mode area fibers for single-mode propagation

2014 ◽  
Vol 39 (15) ◽  
pp. 4561 ◽  
Author(s):  
Aurélien Benoît ◽  
Romain Dauliat ◽  
Raphaël Jamier ◽  
Georges Humbert ◽  
Stephan Grimm ◽  
...  
Keyword(s):  
Single Mode ◽  
Higher Order ◽  
Mode Propagation ◽  
Large Mode Area ◽  
Highly Efficient ◽  
Higher Order Modes ◽  
Mode Area

Optimal Actuator/Sensor Placement for Control of Combustion Instabilities

2001 ◽  
Author(s):  
Nidal Al-Masoud ◽  
Tarunraj Singh
Keyword(s):  
Finite Number ◽  
Lower Order ◽  
Optimality Criteria ◽  
Higher Order ◽  
Control Input ◽  
Combustion Instabilities ◽  
Multiple Sensors ◽  
Higher Order Modes ◽  
Controllability And Observability

Abstract In this paper, a methodology is proposed for determination of optimal actuator and sensor locations for the control of combustion instabilities. The proposed approach relies on certain quantitative measures of degree of controllability and observability based on the controllability and observability grammians. These criteria are arrived at by considering the energies of system’s inputs and outputs. The optimality criteria for sensor and actuator locations provide a balance between the importance of the lower order and the higher order modes. It is assumed that the control input is provided by a finite number of point actuators, and the instantaneous conditions in the chamber are monitored, in general, by multiple sensors.

scholarly journals Broadband robustly single-mode hollow-core PCF by resonant filtering of higher-order modes

2016 ◽  
Vol 41 (9) ◽  
pp. 1961 ◽  
Author(s):  
Patrick Uebel ◽  
Mehmet C. Günendi ◽  
Michael H. Frosz ◽  
Goran Ahmed ◽  
Nitin N. Edavalath ◽  
...  
Keyword(s):  
Single Mode ◽  
Higher Order ◽  
Hollow Core ◽  
Higher Order Modes
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