Page 29 - Fiber Bragg Gratings

10 Chapter 1 Introduction

for simulating the response of the Bragg reflection coupler. Rocking and
mode-converting filters are also presented, along with the side-tap radia-
tion mode and long period grating filter, as band-pass elements.
Chirped gratings have found a niche as dispersion compensators.
Therefore, Chapter 7 is devoted to the application of chirped gratings,
with a detailed look at the dispersive properties related to apodization
and imperfect fabrication conditions on the group delay and reflectivity
of gratings. Further, the effect of stitching is considered for the fabrication
of long gratings, and the effect of cascading gratings is considered for
systems applications. Systems simulations are used to predict the bit-
error-rate performance of both apodized and unapodized gratings. Trans-
mission results are also briefly reviewed.
The applications of gratings in semiconductor and fiber lasers can be
found in Chapter 8. Here configurations of the external cavity fiber Bragg
grating laser and applications in fiber lasers as single and multiple fre-
quency and -wavelength sources are shown. Gain flattening and clamping
of erbium amplifiers is another important area for long-haul high-bit-rate
and analog transmission systems. Finally, the interesting and unique
application of the fiber Bragg grating as a Raman oscillator is shown.
The ninth and final chapter deals with measurements and testing of
Bragg gratings. This includes basic measurements, properties of different
types of gratings, and measurement parameters. Life testing and reliabil-
ity aspects of Bragg gratings conclude the book.

References

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2 Bures J., Lapiere J., and Pascale D., "Photosensitivity effect in optical fibres:
A model for the growth of an interference filter," Appl. Phys. Let. 37(10), 860
(1980).
3 Lam D. W. K. and Garside B. K., "Characterisation of single-mode optical fibre
filters," Appl. Opt. 20(3), 440 (1981).
4 Ohmori Y. and Sasaki Y, "Phase matched sum frequency generation in optical
fibers," Appl. Phys. Lett. 39, 466-468 (1981).
5 Fujii Y, Kawasaki B. S., Hill K. O., and Johnson D. C., "Sum frequency genera-
tion in optical fibers," Opt. Lett. 5, 48-50 (1980).