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We propose a new scheme based on pulsed serrodyne modulation in an optical ring circuit designed to increase the number of wavelengths of optical pulses from a pulse-type multiwavelength light source. As the optical pulses circulate around the ring, the shift in the pulse wavelength increases as a result of the pulsed serrodyne modulation in the ring. By combining the shifted wavelengths of pulses with different round trips in the ring, we can produce a multiple wavelength output with a broad bandwidth. We calculated the spectral characteristics of the multiple wavelengths and confirmed the performance of the scheme experimentally.