I understand the meaning of laser pumping. But i don't understand what is a pump reflector. As a clear definition does not appear online.
In the paper,DESIGN AND DEVELOPMENT OF WIDEBAND HYBRID RAMAN/EDFA FIBER AMPLIFIER of MUDHAFAR HUSSEIN ALI, SHFA 's pumping efficiency is increased because of the adoption of pump reflectors.
excerp1)SHFA with wide gain bandwidth of 65 nm from 1530 nm to 1595 nm and lower gain variation of 0.2 dB. In this design, the pumping efficiency is increased because the signal and pump double–pass the gain medium and adopt pump reflectors.
exerp2)After that, PHFA utilizing power equalization technique was proposed by  in order to reduce the gain variation from 9.8 dB to less than ± 0.5 dB. The authors also used the concept of sharing single pump power by optimally dividing with pump ratio of 1:10. In addition, two pump reflectors are introduced to increase the pumping efficiency. The previous works mentioned above, the input signal was split according to wavelength bands (C and L).
Is thee a difference with the laser pump ?