PROCEEDINGS ARTICLE | October 2, 2006
Proc. SPIE. 6389, Active and Passive Optical Components for Communications VI
KEYWORDS: Beam splitters, Fabry–Perot interferometers, Polarization, Fiber Bragg gratings, Interference (communication), Radio over Fiber, Polarizers, Fiber lasers, Tunable filters, Phase shifts
Photoinscription of superstructured Bragg gratings in Er-Yb codoped fiber is a promising and cost-effective approach to
produce high-quality multi-wavelength fiber lasers for various applications like radio-over-fiber systems, fiber-optic
sensors or low-cost WDM testing source. However, a good understanding of the noise properties of the laser source is
required before these applications can be addressed. Previous modeling has shown that these devices are similar to
compact cascades of single wavelength DFB fiber lasers in which the modes at each wavelength are almost nonoverlapping
along the fiber. In this paper, we further examine the independence of each channel by performing relative
intensity noise (RIN) measurements on a multi-wavelength fiber laser, a dual-polarization fiber laser and a dualwavelength
fiber laser. In each case, we estimate the correlation between the laser lines.
From RIN measurements performed on each channel of a multi-wavelength laser, as well as on the full spectrum, we
compute an average degree of correlation between the RIN of neighboring lines and observed no correlation in most of
the cases. Moreover, each channel displays a single relaxation frequency which is different from those of the other
channels. On the other hand, we observed strong partition noise, with negative correlation, between polarization modes
of a single wavelength fiber laser. Finally, we measured the RIN of the two modes of a dual-wavelength fiber laser with
modes having a greater overlap than the multi-wavelength laser. The results show that the lines share two common
relaxation frequencies, an indication of a dynamic link between them.
