
low compared to the Raman pump power P
pump
, so depletion of the pump power is
negligible. Multiple copies of the gain shape in Fig. 2.20 can be superposed to form
flat gain across a band by multiplexing Raman pumps at appropriately chosen
wavelengths and powers. The output from a single Raman pump laser may be
several hundred milliwatts; the total power for multiplexed pumps may approach
500 mW or higher, depending on design and eye safety targets.
REFERENCES
[1] Li, T., ed. 1985. Optical Fiber Communications, Vol. 1, Fiber Fabrication. Academic Press,
Orlando.
[2] MacChesney, J. B. et al. 1974. A new technique for the preparation of low-loss and graded- ...