会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 10. 发明公开
    • Tunable semiconductor diode laser with distributed reflection and method of manufacturing such a semiconductor diode laser
    • Verstimmbarer半导体二极管激光器与分布反射和制造这样的半导体二极管激光器的方法。
    • EP0375021A1
    • 1990-06-27
    • EP89203139.4
    • 1989-12-11
    • Philips Electronics N.V.
    • Kuindersma, Pieter IdsVan Dongen, Teunis
    • H01S3/106H01S3/085H01L33/00
    • H01S5/06256H01S5/227H01S5/2277
    • A tunable semiconductor diode laser with distributed reflection (DBR semiconductor lasers) having a wide wavelength range is a suitable transmitter or local oscillator in a receiver in heterodyne and coherent optical glass fibre communication systems. Such a diode comprises beside the Bragg section (c) in which the Bragg reflection takes place an active section (4) in which the radiation-emitting active region (13) is present. When such a semiconductor diode laser is further provided with a so-called phase section (B), tuning is possible over a large wavelength range within one oscillation mode.
      It has been found, however, that so-called forbidden zones where no oscillation within the given mode is possible are formed in the wavelength range over which the laser is tunable.
      According to the invention, a laser which is continuously tunable over the whole wavelength range is obtained by providing means (21) with which the intensity of radiation which is reflected at the junction between the active section (A) and the phase section (B) is made low with respect to the intensity of the radiation which returns from the phase section (B) to the active section (A).
      These means comprise an extra radiation-conductive layer (21) in the phase section (B) which adjoins and smoothly merges into the active region (13) situated in the active section (A). When the active section (A) is present centrally in the Bragg section (C) and the phase section (B) the means may also comprise a high-reflecting coating (56) which is present on a free side of the phase section (B). In the latter case the means may also comprise the said extra radiation-conductive layer. The extra radiation-conductive layer (21) and the active region of the first radiation-conductive layer (11) are preferably separated by a passive layer (12) having such a thickness that the said layers (11, 13) are situated within each others amplification profile.
    • 具有宽波长范围内具有分布反射(DBR半导体激光器)的可调谐半导体二极管激光器是在差和相干光导玻璃纤维通信系统的接收器的合适的发送器或本地振荡器。 这样的二极管包括布拉格部(C),其中发生布拉格反射的有源部分(4)存在于发射辐射的有源区(13)是旁边。 当寻求半导体二极管激光器还设置有所谓的相部分(B),调谐可以通过一个振荡模式中的大的波长范围。 已经发现,然而,没有所谓的禁区中给定模式内没有振荡可能形成的波长范围在其上的激光是可调的。 。根据本发明,一个激光所有这是连续可调在整个波长范围是通过提供装置(21)获得具有其中辐射的,其在所述活性部分(A)之间的接合处的反射强度的所有和相位部分(B) 相对于从所述相位部(B)的活性部分(A)返回辐射的强度由低。 这些装置位于相部分(B)邻接额外辐射导电层(21)的包括和平滑地合并到所述有源部分(A)的有源区(13)。 当活性部分(A)存在集中在布拉格部分(C)和相位部分(B)的装置可因此包括高反射涂层(56),所有这些是存在于相部的自由侧(B )。 在后一种情况下,装置可因此包括所述附加辐射导电层。 额外的辐射导电层(21)和所述第一辐射导电层(11)的有源区优选地由一个无源层分离(12),其具有检测厚度DASS死所述层(11,13)位于内的每个 其他扩增曲线。