| 摘要 |
PURPOSE:To transmit an optical signal of many wavelengths through only one fiber with a simplified structure by arranging two or more of stripe-shaped semiconductor light emitting sections of different emission wavelengths on a straight line along a stripe axis so as to have a function of combining those wavelengths. CONSTITUTION:Semiconductor light emitting devices (semiconductor laser or semicon ductor light emitting diode) 2, 3, 4 including stripe-shaped semiconductor light emitting section on a common ground electrode 1 are aligned on a straight line and excited to emit light with two or more different wavelengths located on a straight line when viewed from the side of the laser having wider forbidden band. Hereby, a semiconduc tor light emitting device is constructed which emits an optical signal of a plurality of wavelengths and has a function of synthesizing of those wavelengths. Each semicon ductor light emitting device 2, 3, 4 includes a semiconductor active layer 6, that emits light, formed on an n-type, for example, one conductivity type semiconductor region 5, a p-type, for example, opposite conductivity type semiconductor region 7 formed on the layer 6, and an electrode 8 formed on the region 7. The semiconductor light emitting devices 2, 3, 4 have energy gaps E1, E2, E3, which satisfy the relation, E1<E2<E3, and emit the light of photon energies hnu1, hnu2, hnu3. |
