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20 September 2002 Design of highly flat-output gain equalizers
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Birefringent filters in which several unequal-length birefringent crystal plates are located between two polarizing devices are used to flatten the gain spectrum of erbium-doped fiber amplifiers. The intensity transmission function of birefringent filter is a cosine series containing a finite number of terms. Because the desire intensity function can be transform into a cosine Fourier series which is truncated after an appropriate number of terms, the thickness and the relative rotation angles of each element can be acquired by comparing the intensity transmission function with the cosine expanding series of the desire function. Since the rotation angles of each element are easy to control, the desired function can be realized accurately. With this device, an amplifier can be given with <0.1dB gain variation in 1550nm-1562nm spectrum band. Furthermore, the use of a polarization beam-splitter and a polarization beam-combiner makes this device polarization-independent.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yu Zhou, Liren Liu, Juan Zhang, and Changhe Zhou "Design of highly flat-output gain equalizers", Proc. SPIE 4927, Optical Design and Testing, (20 September 2002);


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