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    • 1. 发明申请
    • GAIN CONTROLLING METHOD AND RECEIVER
    • 增益控制方法与接收机
    • WO1998010514A1
    • 1998-03-12
    • PCT/JP1996002510
    • 1996-09-05
    • MITSUBISHI DENKI KABUSHIKI KAISHATOMOE, Naohito
    • MITSUBISHI DENKI KABUSHIKI KAISHA
    • H03G03/20
    • H03G3/3078H03G3/3052H03G3/3068H04L7/04H04L7/08
    • For a nonperiodical burst signal transmitted from a mobile station in an AGC mode with an unknown transmission power, the AGC is converged in a short time at the beginning of the nonperiodical signal. For a periodical burst signal, transmission power control and interference wave detection are performed according to the presence/absence of the voice signal from the mobile station. These processings are for preventing erroneous control of the AGC and maintaining the communication quality of the radio base station system. In the case of a nonperiodic burst signal, the receiving level is detected at a high speed by only turning on/off an attenuator which has a quick transient response and fixing the gain of the AGC amplifier which has a slow transient response, both being provided as gain control elements. In the case of a periodic burst signal, the erroneous control of AGC is prevented and interferences are detected by utilizing synchronous words contained in the burst signal.
    • 对于从具有未知发射功率的AGC模式的移动站发送的非周期性突发信号,AGC在非周期性信号的开始处在短时间内收敛。 对于周期性突发信号,根据来自移动台的语音信号的存在/不存在来执行发送功率控制和干扰波检测。 这些处理用于防止AGC的错误控制和维持无线基站系统的通信质量。 在非周期性突发信号的情况下,仅通过接通/断开具有快速瞬态响应的衰减器并且固定具有缓慢瞬态响应的AGC放大器的增益来检测接收电平,两者都被提供 作为增益控制元件。 在周期性突发信号的情况下,防止AGC的错误控制,并通过利用突发信号中包含的同步字来检测干扰。
    • 2. 发明申请
    • PULSE POWER SOURCE APPARATUS
    • 脉冲电源设备
    • WO1999034502A1
    • 1999-07-08
    • PCT/JP1997004849
    • 1997-12-25
    • MITSUBISHI DENKI KABUSHIKI KAISHAYABUUCHI, MasatakaIWATA, Akihiko
    • MITSUBISHI DENKI KABUSHIKI KAISHA
    • H02M09/04
    • H03K17/80H03K3/53H05B41/34
    • A pulse power source apparatus which quickly discharges the charged voltage of a capacitor (23) by closing a switch (24). First and second serial circuits (51 and 52) are connected in series between the output terminals of a DC voltage source (2). The first serial circuit (51) is composed of a first reactor (14) and a first forward diode (15), and the second serial circuit (52) is composed of a second forward diode (16) and the switch (24). A third serial circuit (53) composed of the capacitor (23), a second reactor (25), and a discharge tube (9), and the discharge tube is connected in parallel with the second serial circuit (52). When the switch (24) is closed, the discharge tube (9) emits light, but the discharged current from the capacitor (23) becomes an oscillating current and a voltage of the opposite polarity to that of the voltage generated at the initial charging time is generated in the capacitor (23). Since the oscillating voltage is superposed upon the power supply voltage and utilized at the next charging cycle time, an extremely efficient pulse power source apparatus can be obtained.
    • 一种通过闭合开关(24)来快速放电电容器(23)的充电电压的脉冲电源装置。 第一和第二串行电路(51和52)串联连接在DC电压源(2)的输出端子之间。 第一串联电路(51)由第一电抗器(14)和第一正二极管(15)组成,第二串联电路(52)由第二正向二极管(16)和开关(24)构成。 由电容器(23),第二反应器(25)和放电管(9)组成的第三串联电路(53),放电管与第二串联电路(52)并联连接。 当开关(24)关闭时,放电管(9)发光,但是来自电容器(23)的放电电流变为振荡电流,并且与初始充电时间产生的电压相反极性的电压 在电容器(23)中产生。 由于振荡电压叠加在电源电压上并在下一个充电周期时间被利用,所以可以获得极其有效的脉冲电源装置。
    • 7. 发明申请
    • LASER AND METHOD FOR MANUFACTURING THE SAME
    • 激光及其制造方法
    • WO1999031774A1
    • 1999-06-24
    • PCT/JP1997004599
    • 1997-12-15
    • MITSUBISHI DENKI KABUSHIKI KAISHATAKAGI, Kazuhisa
    • MITSUBISHI DENKI KABUSHIKI KAISHA
    • H01S03/18
    • H01S5/0243B82Y20/00H01S5/02208H01S5/12H01S5/2275H01S5/2277H01S5/34306
    • At least part of the layers of the waveguide of a laser, for example, for a DFB-LD, a waveguide including a first clad layer, an active layer, and a second clad layer of a second conductivity type, and, for a ridge type laser, a ridge formed on the remaining thickness of the second clad layer has a witdth such that light leaks out from the side walls of the waveguide formed in the light guiding direction. A case enclosing the side walls of the waveguide is provided, and a fluid having a prescribed refractive index is sealed in the case in such a way that the fluid is in contact with the side walls of the waveguide. The characteristic values of the laser can be adjusted easily. Therefore the laser having uniform characteristic values can be provided at a low cost. This laser is useful as a light source for wavelength multiplex transmission used for optical transmission, etc., of a main line system, such as a submarine cable.
    • 例如用于DFB-LD的激光波导的至少一部分层,包括第一覆盖层,有源层和第二导电类型的第二覆盖层的波导,以及用于脊 在第二包覆层的剩余厚度上形成的脊部的光线从导光方向形成的波导管的侧壁漏出。 提供了包围波导侧壁的壳体,并且具有规定折射率的流体以这样的方式被密封在壳体中,使得流体与波导的侧壁接触。 激光器的特征值可以轻松调整。 因此,可以以低成本提供具有均匀特性值的激光。 该激光器可用作用于诸如海底电缆的主线系统的用于光传输等的波长多路复用传输的光源。