Specialty Optical Fibers Handbook

reported in a 27-m long erbium-doped PANDA-type PM fiber. The fiber trans-

mitted only one polarization mode in the emission wavelength of 1.535 mm while

supporting two polarization modes at the pump wavelength of 1.485 mm [162].

A high-power PM amplifier was demonstrated using an Yb-doped bowtie fiber.

Backward-pumped by a high-power 974-nm diode bar, a 9.5-m long fiber had an

amplified seed signal at a wavelength of 1050 nm with approximately 40 dB

small-signal gain. The saturated output power of 2.3 W and extinction ratio of

17 dB was demonstrated at pump power of 5.7 W [163].

One of the important applications of the rare earth-doped fiber is as a

broadband superfluorescent light source, particularly for navigation-grade

FOG. The advantage of the ...