building a continuous wave erbium doped fiber laser and amplifier
DESCRIPTION
Building a Continuous Wave Erbium Doped Fiber Laser and Amplifier. Ben Baker Kristen Norton. What is a fiber laser?. Why should we care? communications!! long-ranges amplify light in 1.5-μm region = where telecom fibers have loss min requirements - PowerPoint PPT PresentationTRANSCRIPT
Building a Continuous Wave
Erbium Doped Fiber Laser and Amplifier
Ben BakerKristen Norton
What is a fiber laser?• Why should we care?
• communications!! • long-ranges• amplify light in 1.5-μm region = where telecom fibers
have loss min
• requirements• gain medium = fiber with erbium ions (Er3+)
• heavy doping• CW
• pump• signal/feedback
Erbium absorption/emission
http://www.fibercore.com/Fiberpaedia/tabid/84/agentType/View/PropertyID/137/Default.aspx
Emission Spectrum
• depends on • how broad energy levels are• proximity of other Er ions• diode lasers vs fiber lasers• spontaneous emission
vs feedback & gain
EDFL• 980 nm diode laser
• APC connectors
• wavelength division multiplexer
• fusion splicing
• erbium fiber
• removing pump photons
• output coupler varies feedback
• measure output power
• attenuator varies feedback
• optical isolator prevents unwanted feedback
EDFA• no feedback, amplifying
another signal
• measure all output power
Comparing Goals
• Characterize EDFL• pump power vs output power• emission spectrum
• Characterize EDFA• gain = signal power vs output power• amplification of continuous wave & pulse• emission spectra
• spontaneous emission• amplified signal
How??• Power meter, oscilloscopes
• Monochromator, diffraction grating
http://www.sciencetech-inc.com/catalog/13/monochromators/9030
Loop power
Loop power
Output power
Output power
signal = all fiber pulsed EDFL
signal = all fiber pulsed EDFL
signal = Jared and Wesley’s soliton EDFL
signal = Jared and Wesley’s soliton EDFL