NEPCON West - Fiberoptic Expo Conference Proceedings


PIGTAILING OF FABRY-PEROT LASER DIODE TO CLEAVED AND WEDGE-SHAPED SINGLE MODE FIBERS: ALIGNMENT DEPENDENT RIN AND LASER-FIBER COUPLING EFFICIENCY

Authors: Rong Zhang and Frank G. Shi
Company: OE Pkg. & Auto Lab - U of CA
Date Published: 12/3/2002   Conference: NEPCON West - Fiberoptic Expo


Abstract: Relative intensity noise (RIN) is an important performance parameter of a fiber pigtailed laser diode module employed for telecommunication, sensor and many other technological applications. The value of RIN is not only determined by the intrinsic spontaneous emission of the laser diode, but also by the fiber-laser alignment. It is evident that different lensed fibers used can result in different RIN performance.

This work reports for the first time that the RIN performance of an isolator-free Fabry-Perot (FP) laser diode module pigtailed with two different single-mode (SM) lensed fibers, namely, cleaved SM fiber and wedge-shaped end-face SM fiber. It is experimentally demonstrated that the RIN value is a strong function of fiber-laser alignment. Regardless of the type of lensed fiber employed for fiber-laser coupling, there is an optimal fiber-laser alignment location at which the RIN value reaches its minimum. Moreover, it is observed that both RIN minimization and laser power coupling maximization occur at the same alignment position.

Key words: RIN, coupling efficiency, pigtailing, SM fiber, FP laser diode, alignment, testing.



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