Thanks for the insightful video! Just one clarification of a common misconception: In your energy level diagram, L1, L2, and L3 are not single-electron energy levels... they represent the combined energy of all 11 4f electrons in a given erbium (III) ion. Each of those 11 electrons can have a different energy and state of its own, and the specific combinations of those single-electron states results in different 11-electron configurations that have different aggregate energies, e.g., L1, L2, and L3. So the black circles that go up and down represent individual Er(III) ions rather than electrons. When describing these mechanisms, it's better to say "this ion is excited / relaxes" or "this excited state is populated."
I have a question though. 1480nm excites electrons from L1 to L2. Then how could 1550nm photons be emitted again when transition occurs between L2 and L1?
That's what I'm wondering too. Even relaxing from l3 to l2 without emission makes me think energy is partly used for vibrations. Then when the originally l3 or originally l2 are relaxed to l1, if the energy released really is of the same wavelength as the lower energy light, does the remaining energy from those photons that brought the electrons to the excited states simply leave as heat or are the electrons still vibrating at l1?
Hi. sir i have a question? is central wavelength increases or decreases with the increase of pump power in erbium doped fiber laser cavity using saturable absorber?
Rofea Optoelectronics offers a product line of commercial Electro-optic modulators, Phase modulators, Intensity modulator, Photodetectors, Laser light sources, DFB lasers,Optical amplifiers, EDFA, SLD laser, QPSK modulation, Pulse laser, Light detector, Balanced photodetector, Laser driver, Fiber optic amplifier, Optical power meter, Broadband laser, Tunable laser, Optical detector, Laser diode driver, Fiber amplifier. We also provide many particular modulators for customization, such as 1*4 array phase modulators, ultra-low Vpi, and ultra-high extinction ratio modulators, primarily used in universities and institutes. Hope our products will be helpful to you and your research.
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this is the first time that i understand the EDFA states , thank you!!!
Best video created ever in history of electronicss!!!!!!
Thanks for the insightful video! Just one clarification of a common misconception: In your energy level diagram, L1, L2, and L3 are not single-electron energy levels... they represent the combined energy of all 11 4f electrons in a given erbium (III) ion. Each of those 11 electrons can have a different energy and state of its own, and the specific combinations of those single-electron states results in different 11-electron configurations that have different aggregate energies, e.g., L1, L2, and L3. So the black circles that go up and down represent individual Er(III) ions rather than electrons. When describing these mechanisms, it's better to say "this ion is excited / relaxes" or "this excited state is populated."
It's better to call these "black circles" black dots ;-)
Excellent description of EDFA amplification by Dr. Moazzam Tiwana, thank you, Sir.
This is the best video i understood how is amplification done in FO. Thanks in advance for your presentation.
I have a question though. 1480nm excites electrons from L1 to L2. Then how could 1550nm photons be emitted again when transition occurs between L2 and L1?
That's what I'm wondering too. Even relaxing from l3 to l2 without emission makes me think energy is partly used for vibrations. Then when the originally l3 or originally l2 are relaxed to l1, if the energy released really is of the same wavelength as the lower energy light, does the remaining energy from those photons that brought the electrons to the excited states simply leave as heat or are the electrons still vibrating at l1?
why are we using 980 and 1480 nm laser pumps only? why not others?
what is the behaviour of centeral wavelength according to pump power?
Hi. sir i have a question?
is central wavelength increases or decreases with the increase of pump power in erbium doped fiber laser cavity using saturable absorber?
Awesome explanation, thank you
Rofea Optoelectronics offers a product line of commercial Electro-optic modulators, Phase modulators, Intensity modulator, Photodetectors, Laser light sources, DFB lasers,Optical amplifiers, EDFA, SLD laser, QPSK modulation, Pulse laser, Light detector, Balanced photodetector, Laser driver, Fiber optic amplifier, Optical power meter, Broadband laser, Tunable laser, Optical detector, Laser diode driver, Fiber amplifier. We also provide many particular modulators for customization, such as 1*4 array phase modulators, ultra-low Vpi, and ultra-high extinction ratio modulators, primarily used in universities and institutes.
Hope our products will be helpful to you and your research.
Very nice explanation
very easy to understand!
Thank you.
Well explained, thank you
Very nice explaination
thank you sir, very well explained
nice info
good explanation
why we use erbium metal? why not other
Because Erbium gives you the energy states that matches with the operating bandwidth used for optical communication i.e C and L band
good
Pump laser is not LED; it's semiconductor laser !!
@Mr X LED can never be used for pumping