摘要:
The present invention provides a grating structure partially provided in a semiconductor laser device having a first facet of a first reflectivity and a second facet of a second reflectivity which is larger than the first reflectivity. The grating structure extends within a half area near the first facet in the semiconductor laser device. The grating structure has a grating length in a cavity direction of not more than one third of a cavity length defined as a distance between the first and second facets. The grating structure has an integrated coupling coefficient value in the range of 0.4-0.6, the integrated coupling coefficient value is obtained by integrating coupling coefficient of the grating structure with positions in the cavity direction.
摘要:
A distributed feedback laser device comprises an optical waveguide having one end facet serving as a beam emission surface and the other end facet serving as a reflection surface, an active layer formed between the beam emission surface and the reflection surface, and a diffraction grating formed so as to extend along the active layer in the optical waveguide. The active layer has a first region located nearer to the beam emission surface than to the reflection surface and a second region located nearer to the reflection surface than to the beam emission surface. The first region is narrower in width than the second region. The diffraction grating has first and second portions located along the first and the second regions, respectively. The first portion is longer in pitch than the second portion.
摘要:
A dopant such as Si is introduced to recombination layers 2. The Si concentration is about 1×1017 to 5×1018 cm−3. Thus, a carrier lifetime in the recombination layers 2 may be reduced to relatively increase a leakage current flowing the recombination layers 2 while relatively reducing a leakage current flowing channels 3.
摘要翻译:将诸如Si的掺杂剂引入复合层2.Si浓度为约1×10 17至5×10 18 cm -3。 因此,可以减少复合层2中的载流子寿命,以相对地增加流过复合层2的漏电流,同时相对减少流过通道3的漏电流。
摘要:
A semiconductor distributed feedback laser emitting device has upper electrodes arranged in a longitudinal direction of an oscillator for supplying current to the oscillator, and a separating electrode is provided between the upper electrodes for making the distribution of an electric field strength in the longitudinal direction uniform by changing the current density in the separating electrode with respect to the current density in the upper electrodes, thereby improving a second intermodulation distortion.