| 摘要 |
PURPOSE:To couple a plurality of emitted light beams with one optical fiber or single lens system without using a photo multiplexer to provide a system suitable for a light source of multiwavelength optical communication by a method wherein a plurality of distributed reflection type semiconductor lasers (DBR laser) are arranged radially with the first reflectors outside looking from the second reflectors. CONSTITUTION:Four DBR lasers 21, 22, 23 and 24 are arranged radially with a point O as a center. The four DBR lasers 21, 22, 23 and 24 have different respective resonance wavelengths and coupled with respective couples of reflectors DBR 21a and DBR 21b, DBR 22a and DBR 22b, DBR 23a and DBR 23b and DBR 24a and DBR 24b. DBRs 21b, 23b and 24b are composed of two-dimensional gratings and have a function of a Bragg reflector and a function of a grating coupler which takes out a light output to the direction vertical to those DBRs as well. On the other hand, DBRs 21a, 22a, 23a and 24a are composed of one-dimensional gratings and have a function of a Bragg reflector only.
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