Academia.eduAcademia.edu

Figure 6 – uploaded by Jian Chen

See full PDFdownloadDownload figure
Fig. 6. (a) Experimental results of the -3 dB BLP (key in GHzxm units) (high BLP region noted in black dashed line); and (b) normalised measured coupling loss (units in dB) of the 19.2 cm long reference GI polymer multimode waveguide under a 10x microscope objective launch at A = 787 nm (black dashed line indicates the high BLP region shown in (a)).

Figure 6 (a) Experimental results of the -3 dB BLP (key in GHzxm units) (high BLP region noted in black dashed line); and (b) normalised measured coupling loss (units in dB) of the 19.2 cm long reference GI polymer multimode waveguide under a 10x microscope objective launch at A = 787 nm (black dashed line indicates the high BLP region shown in (a)).

Related Figures (10)

Fig. 1. Photograph of (a) the 105.5 cm long spiral and (b) the 19.2 cm long reference waveguide illuminated with red light.
Fig. 1. Photograph of (a) the 105.5 cm long spiral and (b) the 19.2 cm long reference waveguide illuminated with red light.
Fig. 2. Measured refractive index profile of the GI waveguides at the wave- length of 678 nm: (a) Two-dimensional; (b) One-dimensional when vertical offset y = 0 ym (red solid) and horizontal offset x = 0 jm (blue dashed).
Fig. 2. Measured refractive index profile of the GI waveguides at the wave- length of 678 nm: (a) Two-dimensional; (b) One-dimensional when vertical offset y = 0 ym (red solid) and horizontal offset x = 0 jm (blue dashed).
Fig. 3. Experimental setup used for the (a) back-to-back link; (b) 105.5 cm long spiral waveguide link under a 50/125 jzm MMF launch with the use of a MM using pulse generation system | at A = 850 nm; (c) 19.2 cm long reference waveguide link under a 10x microscope objective launch using pulse generation system 2 at A = 787 nm; and near field images of input fibre and lens under the different launch conditions studied: (d) a 50/125 jzm GI MMF; (e) a 50/125 xm GI MMF with a MM; (f) a 10x microscope objective.
Fig. 3. Experimental setup used for the (a) back-to-back link; (b) 105.5 cm long spiral waveguide link under a 50/125 jzm MMF launch with the use of a MM using pulse generation system | at A = 850 nm; (c) 19.2 cm long reference waveguide link under a 10x microscope objective launch using pulse generation system 2 at A = 787 nm; and near field images of input fibre and lens under the different launch conditions studied: (d) a 50/125 jzm GI MMF; (e) a 50/125 xm GI MMF with a MM; (f) a 10x microscope objective.
Fig. 4. Experimental results of the —3 dB bandwidth for the 105.5 cm long spiral polymer multimode waveguides and respective normalised received power for a 50/125 zm MMF input with and without the MM: (a) GI waveguide, no MM (b) GI waveguide, MM (A = 850 nm).
Fig. 4. Experimental results of the —3 dB bandwidth for the 105.5 cm long spiral polymer multimode waveguides and respective normalised received power for a 50/125 zm MMF input with and without the MM: (a) GI waveguide, no MM (b) GI waveguide, MM (A = 850 nm).
Fig. 5. Near field images at the output of (a) the 19.2 cm long reference GI waveguide under restricted launch; (b) the 105.5 cm long spiral GI waveguide under a 50/125 m MMF launch without the MM.
Fig. 5. Near field images at the output of (a) the 19.2 cm long reference GI waveguide under restricted launch; (b) the 105.5 cm long spiral GI waveguide under a 50/125 m MMF launch without the MM.
Fig. 8. Normalised received power versus position of input 50/125 jzm MMF: (a) a 50/125 xm MMF with no MM (PMN < 15); (b) a 50/125 zm MMF with MM (PMN < 22). Fig. 7. Assumed mode power distribution inside the input 50/125 zm MMF patchcord for condition: (a) a 50/125 zm MMF with no MM (PMN < 15); (b) a 50/125 «4m MMF with MM (PMN < 22).
Fig. 8. Normalised received power versus position of input 50/125 jzm MMF: (a) a 50/125 xm MMF with no MM (PMN < 15); (b) a 50/125 zm MMF with MM (PMN < 22). Fig. 7. Assumed mode power distribution inside the input 50/125 zm MMF patchcord for condition: (a) a 50/125 zm MMF with no MM (PMN < 15); (b) a 50/125 «4m MMF with MM (PMN < 22).
Fig. 9. Simulation and experimental results for the 105.5 cm long spira polymer multimode waveguides for a 50/125 4m MMF input with and withouw MM: (a) GI waveguide, no MM; (b) GI waveguide, MM (A = 850 nm).
Fig. 9. Simulation and experimental results for the 105.5 cm long spira polymer multimode waveguides for a 50/125 4m MMF input with and withouw MM: (a) GI waveguide, no MM; (b) GI waveguide, MM (A = 850 nm).
Fig. 10. Simulation results of the —3 dB BLP (unit in GHz xm) of the 19.2 cm long reference GI polymer multimode waveguide for a 10x microscope objec- tive launch at 1 = 787 nm.
Fig. 10. Simulation results of the —3 dB BLP (unit in GHz xm) of the 19.2 cm long reference GI polymer multimode waveguide for a 10x microscope objec- tive launch at 1 = 787 nm.
The electrical field distributions of the guided fibre modes inside the MMF and the corresponding propagation constants are calculated using an analytic mode solver. The refractive index profile of the MMF and the operating wavelength are the input parameters of the calculation, and subsequently the linear polarized (LP) modes with indices m (cylindrical order) and n (radial order) can be obtained [40]. The modes can be divided into degenerated groups indexed by the PMN defined as m + 2n + 1. The power coupling coefficient c;; (i.e., power coupled into each waveguide mode i from each fibre mode 7) can be expressed as (in polar coordinates): where E;;", E! are the electric fields of the waveguide mode 7 and fibre mode 7, respectively. The power p;’ coupled into each waveguide mode i can be expressed as the multiplication of the coefficient matrix c;; and the power pl ’; Of the fibre modes (j = 1,..., M where M is the number of fibre modes):
The electrical field distributions of the guided fibre modes inside the MMF and the corresponding propagation constants are calculated using an analytic mode solver. The refractive index profile of the MMF and the operating wavelength are the input parameters of the calculation, and subsequently the linear polarized (LP) modes with indices m (cylindrical order) and n (radial order) can be obtained [40]. The modes can be divided into degenerated groups indexed by the PMN defined as m + 2n + 1. The power coupling coefficient c;; (i.e., power coupled into each waveguide mode i from each fibre mode 7) can be expressed as (in polar coordinates): where E;;", E! are the electric fields of the waveguide mode 7 and fibre mode 7, respectively. The power p;’ coupled into each waveguide mode i can be expressed as the multiplication of the coefficient matrix c;; and the power pl ’; Of the fibre modes (j = 1,..., M where M is the number of fibre modes):
Related topics:
Electrical EngineeringElectronic EngineeringPolymer EngineeringOptical EngineeringOpticsOptical Fiber CommunicationsFiber OpticsPolymer ChemistryOptical CommunicationFemtosecond Laser
580 California St., Suite 400
San Francisco, CA, 94104
© 2025 Academia. All rights reserved