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    • 3. 发明授权
    • Phototransistor with quantum well base structure
    • 具有量子阱结构的光电晶体管
    • US5399880A
    • 1995-03-21
    • US104969
    • 1993-08-10
    • Naresh Chand
    • Naresh Chand
    • H01L31/0352H01L31/11H01L27/14H01L31/00
    • B82Y20/00H01L31/035254H01L31/1105
    • A long wavelength (6 to 20 .mu.m) phototransistor is described which has n-doped silicon as emitter and collector regions bracketing a base region having a quantum well structure made up of alternating layers of p-doped silicon germanium and undoped silicon, The silicon germanium layer adjacent to the emitter region is thicker and has a higher percentage of germanium in order to provide a quantum well that is wider and deeper than the other quantum wells in the base region thereby resulting in a larger current and optical gain. The silicon barrier layer of the quantum well closest to the collector region is p-doped in order to reduce the leakage current of the base-collector junction.
    • 描述了长波长(6至20μm)的光电晶体管,其具有作为发射极的n掺杂硅,并且收集器区域包围具有由p掺杂硅锗和未掺杂硅的交替层组成的量子阱结构的基极区域。硅 与发射极区相邻的锗层较厚并且具有较高百分比的锗,以便提供比基极区域中的其它量子阱更宽更深的量子阱,从而导致更大的电流和光学增益。 最接近集电极区域的量子阱的硅势垒层是p掺杂的,以便减小基极 - 集电极结的漏电流。
    • 4. 发明申请
    • Communication network with secure access for portable users
    • 具有便携式用户安全访问的通信网络
    • US20110087879A1
    • 2011-04-14
    • US12587743
    • 2009-10-13
    • Naresh ChandBruce M. Eteson
    • Naresh ChandBruce M. Eteson
    • H04L9/00H04K1/00H04L12/56
    • H04K3/827H04K3/25H04K2203/14H04K2203/18H04L63/105H04L63/18
    • A communication network includes a local area network (LAN) and a wireless access point coupled to the LAN. In one embodiment, each access point includes a medium access control (MAC) stage, and a radio frequency (RF) transmitter/receiver for communicating unsecure message data via RF links with users of associated wireless devices. An optical transmitter/receiver in the access point enables the users to communicate secure message data over the LAN via free space optical (FSO) links with the users. The MAC stage operates (i) to direct unsecure data from the LAN to the wireless device users and to direct unsecure data from the users to the LAN, via the RF transmitter/receiver; and (ii) to direct secure data from the LAN to the wireless device users and to direct secure data from the users to the LAN, via the optical transmitter/receiver. An integrated VoIP/FSO portable handset is also disclosed.
    • 通信网络包括局域网(LAN)和耦合到LAN的无线接入点。 在一个实施例中,每个接入点包括介质访问控制(MAC)级,以及用于经由RF链路与不相关无线设备的用户通信不安全消息数据的射频(RF)发射机/接收机。 接入点中的光发射机/接收机使得用户能够通过与用户的自由空间光(FSO)链路在LAN上传送安全消息数据。 MAC级操作(i)将不安全的数据从LAN引导到无线设备用户,并通过RF发射机/接收机将不安全的数据从用户引导到LAN; 以及(ii)将来自LAN的安全数据引导到无线设备用户,并经由光发射机/接收机将来自用户的安全数据引导至LAN。 还公开了一种集成的VoIP / FSO便携式手持机。
    • 9. 发明授权
    • Communication network with secure access for portable users
    • 具有便携式用户安全访问的通信网络
    • US08406427B2
    • 2013-03-26
    • US12587743
    • 2009-10-13
    • Naresh ChandBruce M. Eteson
    • Naresh ChandBruce M. Eteson
    • H04L29/06
    • H04K3/827H04K3/25H04K2203/14H04K2203/18H04L63/105H04L63/18
    • A communication network includes a local area network (LAN) and a wireless access point coupled to the LAN. In one embodiment, each access point includes a medium access control (MAC) stage, and a radio frequency (RF) transmitter/receiver for communicating unsecure message data via RF links with users of associated wireless devices. An optical transmitter/receiver in the access point enables the users to communicate secure message data over the LAN via free space optical (FSO) links with the users. The MAC stage operates (i) to direct unsecure data from the LAN to the wireless device users and to direct unsecure data from the users to the LAN, via the RF transmitter/receiver; and (ii) to direct secure data from the LAN to the wireless device users and to direct secure data from the users to the LAN, via the optical transmitter/receiver. An integrated VoIP/FSO portable handset is also disclosed.
    • 通信网络包括局域网(LAN)和耦合到LAN的无线接入点。 在一个实施例中,每个接入点包括介质访问控制(MAC)级,以及用于经由RF链路与不相关无线设备的用户通信不安全消息数据的射频(RF)发射机/接收机。 接入点中的光发射机/接收机使得用户能够通过与用户的自由空间光(FSO)链路在LAN上传送安全消息数据。 MAC级操作(i)将不安全的数据从LAN引导到无线设备用户,并通过RF发射机/接收机将不安全的数据从用户引导到LAN; 以及(ii)将来自LAN的安全数据引导到无线设备用户,并经由光发射机/接收机将来自用户的安全数据引导至LAN。 还公开了一种集成的VoIP / FSO便携式手持机。