A Yb-fiber amplifier seeded by a 1083 nm DBR diode laser is fiber coupled with an external cavity diode laser (814 nm to 870 nm) and differencefrequency mixed in a periodically poled lithium niobate crystal (3.25 μm to 4.4 μm). Phase matching characteristics and the spectroscopic detection of several trace gases using this compact sensor will be reported. OCIS code: (190.2620) Frequency convers...

Abstract In this paper, an improved whale algorithm to optimize pump power and wavelengths of second-order fiber Raman amplifier (FRA) has been proposed. Adopted by the strategies adaptive gradients reverse learning, normal is greatly improved. An optimized FRA designed based on six-wavelength backward structure. Compared optimizing both wavelength with only power, gain flatness curves two algo...

In this paper, we show that by combining experimental data from different optical fibers, can build a fiber-agnostic neural-network to model the Raman amplifier. The NN predict gain profile of new fiber type (unseen during training) with maximum absolute error as low 0.22 dB. We generalization is only possible when unseen parameters are similar fibers used model. Therefore, training dataset wid...

We demonstrate the active wavefront control of a 19-core ytterbium-doped fiber amplifier by the digital holography technique. The output wavefront is corrected even in the presence of large externally induced perturbations, with a measured output Strehl ratio of 0.6 in all cases. The wavefront-controlled multicore fiber is used to amplify 800 ps pulses at 1064 nm at a repetition rate of 40?kHz,...

• Understand the principle of operation of the erbium-doped fiber amplifier (EDFA). • Construct an EDFA and an erbium-doped fiber laser. • Measure and calculate the essential parameters of the constructed EDFA. The basic theories on optical amplification by erbium-doped fibers are presented in this section as preparation for the discussions on noise characteristics and noise reduction methods p...

Effect of birefringent disorder on the Bit Error Rate (BER) in an optical fiber telecommunication system subject to amplifier noise may lead to extreme outages, related to anomalously large values of BER. We analyze the Probability Distribution Function (PDF) of BER for various strategies of Polarization Mode Dispersion (PMD) compensation. A compensation method is proposed that is capable of mo...

Erbium-doped fiber amplifiers ~EDFAs! have been intensively studied for wavelength-division-multiplexing ~WDM! communication systems. The stabilization of the amplifier gain against the input signal-power variation is one of the key issues for WDM networks. The gainstabilizing technique using a passive optical feedback device, such as a bandpass filter or a fiber Bragg grating, has been reporte...