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    • 4. 发明授权
    • Method and apparatus for increasing the processing capacity of optical
digital processing systems having optically bistable devices
    • 具有光学双稳态器件的光学数字处理系统的处理能力增加的方法和装置
    • US4914286A
    • 1990-04-03
    • US340975
    • 1989-04-20
    • Leo M. F. ChirovskyAnthony L. LentineDavid A. B. Miller
    • Leo M. F. ChirovskyAnthony L. LentineDavid A. B. Miller
    • G02F3/02G06E1/00
    • G02F3/028
    • An optically bistable device, such as a symmetric self electro-optic effect device (S-SEED), is forced into a metastable state prior to the incidence of an optical input signal thereto, thereby increasing the sensitivity of the optically bistable device to the optical input signal, reducing both the switching time and the optical input signal energy required to switch the device. The metastable state is entered into by one of three techniques: (1) turning off the bias voltage V.sub.0 of the device with optical bias beams on then turning on the bias voltage V.sub.0 with the optical bias beams off; (2) applying a predetermined voltage to a node in the device, the predetermined voltage being substantially the metastable state voltage or V.sub.0 /2; or (3) subjecting the device to equal intensity optical bias beams having a wavelength longer than the exciton wavelength. In the second case, optical bias beams and optical input signal beams may be applied simultaneously with the application of the predetermined voltage. In the last case, optical bias beams (at the exciton wavelength) and the optical input signal beams can be applied simultaneously after removal of the long-wavelength optical bias beams, thus saving switching time. In addition, the optically bistable device may be selectively placed in the metastable state and the optical input signal have sufficient energy to switch the device only when it is in the metastable state. This allows for multiple optically bistable devices to be selectively responsive to a common optical input signal, such as in a demultiplexer.
    • 5. 发明授权
    • Optical device with quantum well absorption
    • 具有量子阱吸收的光学器件
    • US4751378A
    • 1988-06-14
    • US42202
    • 1987-04-24
    • Harvard S. HintonAnthony L. LentineDavid A. B. Miller
    • Harvard S. HintonAnthony L. LentineDavid A. B. Miller
    • G02F1/017G02F3/02H01J40/14
    • B82Y20/00G02F1/01716G02F3/028
    • An optically bistable device 100 is disclosed having a self electro-optic effect device (SEED) 104 and a variable optical attenuator 103 for maintaining the state of the SEED over a wide power range of two input light beams. The SEED is responsive to the relative power levels of the two input light beams for assuming one of two states. The state of the SEED is determined by the transmission level of one of the beams passing through quantum well region 102 of the device. The variable optical attenuator concomitantly varies the power level of the two input beams to maintain the present state of the SEED over a wide range of input light beam powers. When operated in a bistable operating region of the device, a control light beam with a low power level changes the device from one state to another. Two threshold values of a ratio of power between the two input beams establish where the device switches from one state to the other.
    • 公开了一种光学双稳态装置100,其具有用于在两个输入光束的宽功率范围内保持SEED的状态的自电光效应装置(SEED)104和可变光衰减器103。 SEED响应于两个输入光束的相对功率电平,用于采用两种状态之一。 SEED的状态由通过设备的量子阱区域102的一个光束的透射电平决定。 可变光衰减器同时改变两个输入光束的功率电平,以保持SEED在宽的输入光束功率范围内的当前状态。 当在设备的双稳态操作区域中操作时,具有低功率电平的控制光束将设备从一个状态改变到另一个状态。 两个输入光束之间的功率比的两个阈值确定了设备从一个状态切换到另一个状态。
    • 10. 发明授权
    • Symmetric optical device with quantum well absorption
    • 具有量子阱吸收的对称光学器件
    • US4754132A
    • 1988-06-28
    • US42411
    • 1987-04-24
    • Harvard S. HintonAnthony L. LentineDavid A. B. Miller
    • Harvard S. HintonAnthony L. LentineDavid A. B. Miller
    • G02F3/00G02F3/02G11C7/00H01L31/0352H01L31/105H01J40/14
    • B82Y20/00G02F3/028G11C7/005H01L31/035236H01L31/105
    • An optically bistable device 100 is disclosed having first and second semiconductor multiple quantum well regions 101 and 102 with complementary high and low absorption levels for emitting first and second output light beams 162 and 163 having complementary low and high power levels. The optical device comprises first and second photodetectors 103 and 104 having respective quantum well regions 101 and 102. The photodetectors are responsive to first and second light beams 160 and 161 for electrically controlling the optical absorption of each of the two quantum well regions. The state of the device is determined by the transmission level of light beam 161 passing through multiple quantum well region 102 and being emitted as output light beam 162, whereas the complementary state of the device is determined by the transmission level of complementary output light beam 162. A variable optical attenuator 701 concomitantly and proportionally varies the power level of input light beams 160 and 161 to maintain the state of the device over a wide range of input powers. When operated in the bistable operating region of the device, either one of control light beams 180 and 181 with a low power level changes the device from one state to the other. Two threshold values of the ratio of the power of the light incident on the two photodetectors establishes where the device switches from one state to the other.
    • 公开了具有用于发射具有互补的低功率和高功率电平的第一和第二输出光束162和163的具有互补的高和低吸收水平的第一和第二半导体多量子阱区域101和102的光学双稳态器件100。 光学器件包括具有相应量子阱区域101和102的第一和第二光电探测器103和104.光电探测器响应于第一和第二光束160和161,用于电控制两个量子阱区域中的每一个的光学吸收。 器件的状态由通过多个量子阱区域102并作为输出光束162发射的光束161的透射电平确定,而器件的互补状态由互补输出光束162的透射电平 可变光衰减器701同时且成比例地改变输入光束160和161的功率电平,以将器件的状态保持在宽范围的输入功率上。 当在装置的双稳态工作区域中操作时,具有低功率电平的控制光束180和181中的任一个将装置从一个状态改变到另一个状态。 入射到两个光电探测器上的光的功率比的两个阈值确定了器件从一个状态切换到另一个状态。