VARIABLE WAVELENGTH MODE SYNCHRONIZATION LASER AND METHOD OF MANUFACTURING THE SAME

摘要

PROBLEM TO BE SOLVED: To give sufficient dispersion resistance to the variable wavelength mode synchronization laser when it is used for transmission and loosen the limitation on the frequency of mode synchronization. SOLUTION: A distributed Bragg grating 148 of the variable wavelength mode synchronization laser is provided with N diffraction regions for reflecting the light beams in the oscillation wavelengthsλ1 toλN. Each diffraction region of N diffraction regions has the pitch which continuously changes around the pitch corresponding to the oscillation wavelengthλn for the nth diffraction region (1<=n<=N, n is an integer), also has a diffraction grating each diffracton grating of 148) for reflecting the light of the oscillation wavelengthλn. Moreover, apodization 143 is also applied thereto.