(c) If the above fiber is illuminated with IR light that has a vacuum wavelength of 2.50um, determine: the V-number of the system. (i) (ii) the number of modes that can propagate in the fiber [5] -.. .. .. .. ....
(c) If the above fiber is illuminated with IR light that has a vacuum wavelength of 2.50um, determine: the V-number of the system. (i) (ii) the number of modes that can propagate in the fiber [5] -.. .. .. .. ....
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answer part (C)
![(b) A step index fiber has a numerical aperture, NA = 0.2588, core refractive index
1.5 , cladding refractive index = 1.47 and a diameter 125µm. A light source is
coupled to this fiber which emits 75% of its light into a 60 degree full-cone
angle, 50% into a 30 degree cone and 25% into a 15 degree cone, Calculate the
following when this source and fiber are connected:
(i)
Acceptance angle
(ii}
Coupling efficiency
(ii)
The critical angle at the core cladding interface
[9]
(c) If the above fiber is illuminated with IR light that has a vacuum wavelength of
2.50µm, determine:
(i)
(ii)
the V-number of the system.
the number of modes that can propagate in the fiber
[5]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F70d86970-59e6-4750-a0d7-1a72be8e9bdd%2F035a031b-3bd7-4066-987a-072737b96773%2Fx972396_processed.jpeg&w=3840&q=75)
Transcribed Image Text:(b) A step index fiber has a numerical aperture, NA = 0.2588, core refractive index
1.5 , cladding refractive index = 1.47 and a diameter 125µm. A light source is
coupled to this fiber which emits 75% of its light into a 60 degree full-cone
angle, 50% into a 30 degree cone and 25% into a 15 degree cone, Calculate the
following when this source and fiber are connected:
(i)
Acceptance angle
(ii}
Coupling efficiency
(ii)
The critical angle at the core cladding interface
[9]
(c) If the above fiber is illuminated with IR light that has a vacuum wavelength of
2.50µm, determine:
(i)
(ii)
the V-number of the system.
the number of modes that can propagate in the fiber
[5]
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