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This model LC9XU400-74P replaces old model LC96A74P-20R. With bare PM fiber pigtail without connector. See manufacture test data at the last two pdf links below. See datasheet at 1st pdf link below. Product Overview These lasers are designed as pump sources for erbium doped fiber amplifier (EDFA) applications. Processes and techniques of coupling the fiber to the laser allow high output powers that are very stable with both time and temperature. The 9X series pump module utilizes a fiber Bragg grating design for enhanced wavelength and power stability performance. This product has been designed to ensure superior wavelength locking over drive current, temperature and optical feedback changes. Note that the internal monitor photodiode is intended for diagnostic purposes only. For the PM fiber performance and fusion: PMF over SMF on 980nm pump laser has better spectrum stability and SMSR performance. So PM fiber is better than SM fiber usually, especially at high power, but it is not so huge. As for 980nm, the pump power will shift to signal power finally, so the difference could be neglected. For the fusion between PM fiber and SM fiber, PMF splicer is better. SMF splicer is still ok, you need choose special splice program or you make your own program. The key is, you should choose the right splicing type: cladding alignment. So the thin core will insert into the thick core totally.