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1. 发明授权

US06771908B2 Fast protection switching by snooping on downstream signals in an optical network 有权
标题翻译：通过窥探光网络中的下行信号进行快速保护切换
公开(公告)号：US06771908B2
公开(公告)日：2004-08-03
申请号：US09781863
申请日：2001-02-12
申请人： Peter Van Eijk , Reed K. Even , Piet Van Heyningen , Song Jiang , Kyeong-Soo Kim , Woojune Kim , Fengkun Liu , Yong-Kwan Park
发明人： Peter Van Eijk , Reed K. Even , Piet Van Heyningen , Song Jiang , Kyeong-Soo Kim , Woojune Kim , Fengkun Liu , Yong-Kwan Park
IPC分类号： H04B1008
CPC分类号： H04J14/0291 , H04B10/032 , H04B10/272 , H04J3/0682 , H04J14/0282 , H04Q11/0066 , H04Q11/0067 , H04Q2011/0079 , H04Q2011/0081 , H04Q2011/0083
摘要： An optical network has an optical splitter connected to (1) a working optical subscriber unit (OSU) of a working circuit, (2) a protection OSU of a protection circuit, and (3) one or more optical network terminals (ONTs), where an ONT has (i) a working line termination (LT) unit of the working circuit and connected to the optical splitter via a working optical fiber and (ii) a protection LT unit of the protection circuit and connected to the optical splitter via a protection optical fiber. The present invention enables fast protection switching from the working circuit to the protection circuit. The arrival times of corresponding downstream cells are measured at both the working and protection LT units of the ONT, and information related to the arrival times is transmitted from the ONT to the protection OSU. A propagation delay value is generated based on the transmitted information for use by the protection OSU for communications with the ONT if and when protection switching is implemented upon detection of a failure in the working circuit.
摘要翻译：光网络具有连接到（1）工作电路的工作光用户单元（OSU）的光分路器，（2）保护电路的保护OSU，以及（3）一个或多个光网络终端（ONT）其中ONT具有（i）工作电路的工作线路终端（LT）单元，并且经由工作光纤连接到分光器，以及（ii）保护电路的保护LT单元，并经由保护光纤。本发明能够从工作电路到保护电路的快速保护切换。在ONT的工作和保护LT单元上测量相应下游单元的到达时间，并且与ONT相关的信息从ONT发送到保护OSU。如果在检测到工作电路中的故障时实现保护切换，则基于被保护OSU用于与ONT通信的传输信息生成传播延迟值。

2. 发明授权

US06778781B2 Health check algorithm for protection circuit in optical network 有权
标题翻译：光网络保护电路的健康检查算法
公开(公告)号：US06778781B2
公开(公告)日：2004-08-17
申请号：US09781862
申请日：2001-02-12
申请人： Peter Van Eijk , Reed K. Even , Piet Van Heyningen , Song Jiang , Kyeong-Soo Kim , Woojune Kim , Fengkun Liu , Yong-Kwan Park
发明人： Peter Van Eijk , Reed K. Even , Piet Van Heyningen , Song Jiang , Kyeong-Soo Kim , Woojune Kim , Fengkun Liu , Yong-Kwan Park
IPC分类号： H04B1008
CPC分类号： H04B10/272 , H04B10/077 , H04B10/07955 , H04B10/27 , H04J3/0682
摘要： An optical network has an optical splitter connected to (1) a working optical subscriber unit (OSU) of a working circuit via a working optical fiber, (2) a protection OSU of a protection circuit via a protection optical fiber, and (3) one or more optical network terminals (ONTs), where the protection OSU has a protection burst mode receiver (BMR) configured to receive an upstream optical signal from the optical splitter. The algorithm determines whether the protection OSU is functioning improperly. A reset pulse is applied at the protection BMR at a particular timing position and an attempt is made to interpret the current upstream cell received at the protection BMR. This process is repeated using different timing positions for the BMR reset pulse until the current upstream cell is correctly interpreted, e.g., based on the correct identification of an ATM header error correction (HEC) byte in the upstream cell. If, after a specified number of cycles, no upstream cells are correctly interpreted, then the protection circuit is determined to have failed. In one embodiment, the algorithm is based on a cell delineation procedure implemented as a state machine.
摘要翻译：光网络具有通过工作光纤连接到（1）工作电路的工作光用户单元（OSU）的光分路器，（2）经由保护光纤的保护电路的保护OSU，以及（3）一个或多个光网络终端（ONT），其中保护OSU具有被配置为从光分路器接收上行光信号的保护突发模式接收器（BMR）。该算法确定保护OSU是否正常工作。在特定定时位置处的保护BMR处施加复位脉冲，并尝试解释在保护BMR处接收到的当前上行单元。使用不同的BMR复位脉冲的定时位置重复该过程，直到例如基于上游单元中的ATM标题纠错（HEC）字节的正确识别来正确解释当前上行单元。如果在指定数量的周期之后没有正确解释上游单元，则确定保护电路发生故障。在一个实施例中，该算法基于实现为状态机的小区描绘过程。

3. 发明授权

US06868232B2 Fast protection switching by snooping on upstream signals in an optical network 有权
标题翻译：通过窥探光网络上的上行信号进行快速保护切换
公开(公告)号：US06868232B2
公开(公告)日：2005-03-15
申请号：US09781864
申请日：2001-02-12
申请人： Peter Van Eijk , Reed K. Even , Piet Van Hevingen , Song Jiang , Kyeong-Soo Kim , Woojune Kim , Fengkun Liu , Yong-Kwan Park
发明人： Peter Van Eijk , Reed K. Even , Piet Van Hevingen , Song Jiang , Kyeong-Soo Kim , Woojune Kim , Fengkun Liu , Yong-Kwan Park
IPC分类号： H04B10/08 , H04B1/74 , H04B10/00 , H04J3/00 , H04L12/44 , H04Q11/00
CPC分类号： H04J14/0291 , H04B10/032 , H04J3/0682 , H04J14/0282 , H04Q11/0066 , H04Q11/0067 , H04Q2011/0079 , H04Q2011/0081 , H04Q2011/0083
摘要： An optical network has an optical splitter connected to (1) a working optical subscriber unit (OSU) of a working circuit via a working optical fiber, (2) a protection OSU of a protection circuit via a protection optical fiber, and (3) one or more optical network terminals (ONTs). The present invention enables fast protection switching from the working OSU to the protection OSU. In one embodiment, the arrival times of corresponding upstream ranging reply PLOAM cells are measured at both the working and protection OSUs during ranging operations of the working OSU. In another embodiment, a cell delineation procedure is initiated at the protection OSU during normal, non-ranging operations of the working OSU to enable the protection OSU to correctly delineate upstream cells and the arrival times of corresponding upstream cells are then measured at both the working and protection OSUs. In either case, a propagation delay value is generated based on the measured arrival times for use by the protection OSU for communications with the one or more ONTs if and when protection switching is implemented upon detection of a failure in the working circuit, possibly without requiring the protection OSU to perform any ranging for the one or more ONTs.
摘要翻译：光网络具有通过工作光纤连接到（1）工作电路的工作光用户单元（OSU）的光分路器，（2）经由保护光纤的保护电路的保护OSU，以及（3）一个或多个光网络终端（ONT）。本发明能够从工作OSU到保护OSU的快速保护切换。在一个实施例中，相应的上游测距答复PLOAM小区的到达时间在工作OSU的测距操作期间在工作和保护OSU两者处测量。在另一个实施例中，在正常的非工作OSU的非测距操作期间，在保护OSU处启动小区描述过程，以使得保护OSU能够正确地描绘上游小区，然后在工作OSU上测量相应的上行小区的到达时间和保护OSU。在任一情况下，如果在检测到工作电路中的故障时实施保护切换，则可以基于所保护的OSU用于与一个或多个ONT通信的测量到达时间来生成传播延迟值，可能不需要保护OSU为一个或多个ONT执行任何测距。

4. 发明授权

US06763193B1 Optical communication system optically combining both baseband and passband signals 有权
标题翻译：光通信系统光学地组合基带和通带信号
公开(公告)号：US06763193B1
公开(公告)日：2004-07-13
申请号：US09450823
申请日：1999-11-29
申请人： Naresh Chand , Thomas Henry Daugherty , Wouterus Muys , Yong-Kwan Park , Venkataraman Swaminathan
发明人： Naresh Chand , Thomas Henry Daugherty , Wouterus Muys , Yong-Kwan Park , Venkataraman Swaminathan
IPC分类号： H04J1400
CPC分类号： H04N7/22 , H04B10/272 , H04B10/503 , H04B10/506 , H04B10/5161 , H04B10/5561 , H04J14/0226 , H04J14/0232 , H04J14/0247 , H04J14/0252 , H04J14/0282 , H04J14/0298
摘要： This invention is a new communication system in which multichannel broadcast digital services are distributed to each user with the broadcast services signal riding in the passband above a digital baseband signal. The system can deliver more than 1 Gbps additional bandwidth to each subscriber. The passband bandwidth will accommodate growth in downstream services including video on demand, higher speed web downloads including improved streaming audio and video, HDTV, interactive video, and personalized video. The invention requires only a single fiber path and a single optical receiver for each user or group of users. A single fiber, single optical receiver system is much less expensive than two systems, one transmitting baseband and the other passband. A single receiver is greatly cost beneficial to achieving economical fiber to the home.
摘要翻译：本发明是一种新的通信系统，其中多通道广播数字业务被分配给每个用户，广播业务信号在数字基带信号上方通过通带。该系统可以为每个用户提供超过1 Gbps的附加带宽。通带带宽将适应下游业务的增长，包括视频点播，更高速度的网络下载，包括改进的流式音频和视频，HDTV，交互式视频和个性化视频。本发明对于每个用户或用户组仅需要单个光纤路径和单个光接收机。单光纤单光接收机系统比两个系统便宜得多，一个发射基带和另一个通带。单个接收器对于实现经济的光纤到家是非常有益的。

5. 发明授权

US5208817A Modulator-based lightwave transmitter 失效
标题翻译：基于调制器的光波发射器
公开(公告)号：US5208817A
公开(公告)日：1993-05-04
申请号：US866616
申请日：1992-04-10
申请人： Ming-Lai Kao , Yong-Kwan Park
发明人： Ming-Lai Kao , Yong-Kwan Park
IPC分类号： H04B10/04 , G02F1/01 , G02F1/03 , G02F1/035 , H04B10/06 , H04B10/14 , H04B10/155
CPC分类号： H04B10/588 , G02F1/0123 , H04B10/505 , H04B10/50575
摘要： An externally modulated laser-based transmitter is disclosed which utilizes an automatic bias control (ABC) circuit to maintain the bias voltage applied to the external modulator at a predetermined level required to provide the necessary separation between logic levels. The ABC circuit generates a dither signal and functions to digitally compare the phase of the dither signal to the phase of the optical signal produced by the external modulator. A phase comparator (e.g., D-type flip-flop) is used to monitor any drift in the optimum bias point of the modulator and generate an output correction signal by continuously adjusting the level of the DC bias voltage applied to the external modulator.

6. 发明授权

US5539563A System and method for simultaneously compensating for chromatic dispersion and self phase modulation in optical fibers 失效
标题翻译：用于同时补偿光纤色散和自相位调制的系统和方法
公开(公告)号：US5539563A
公开(公告)日：1996-07-23
申请号：US253174
申请日：1994-05-31
申请人： Yong-Kwan Park
发明人： Yong-Kwan Park
IPC分类号： H04B10/02 , H04B10/18 , H04B10/00
CPC分类号： H04B10/2525 , H04B10/255 , H04B2210/252
摘要： At least one dispersion compensating fiber (DCF) is utilized to compensate for chromatic dispersion of an externally modulated signal carried by at least one single mode, standard fiber optic cable. The self phase modulation (SPM) effect in the standard fiber is characterized by a pulse compression and associated pulse distortion when a 1550 nm wavelength signal is launched into the fiber. Because the SPM effect in the DCF fiber is characterized by a pulse broadening for the same signal, the DCF fiber is also utilized to compensate for the SPM effect in the standard fiber. To this end, the signal power launched into the DCF fiber is controlled such that precise compensation for the SPM effect in the standard fiber can be achieved. Control of the launching power is needed because the mode field diameter of the DCF fiber is smaller than that of the standard single mode fiber so that the DCF fiber experiences the SPM effect at a lower power than the single mode fiber.
摘要翻译：使用至少一个色散补偿光纤（DCF）来补偿由至少一个单模标准光纤电缆承载的外部调制信号的色散。标准光纤中的自相位调制（SPM）效应的特征在于当1550nm波长信号被发射到光纤中时脉冲压缩和相关的脉冲失真。由于DCF光纤中的SPM效应的特征在于相同信号的脉冲宽度，DCF光纤也用于补偿标准光纤中的SPM效应。为此，控制发射到DCF光纤的信号功率，从而可以实现标准光纤中SPM效应的精确补偿。需要控制发射功率，因为DCF光纤的模场直径小于标准单模光纤的模场直径，使得DCF光纤以比单模光纤更低的功率体验SPM效应。

7. 发明授权

US5329396A Reduction of stimulated brillouin scattering in a fiber optic transmission system 失效
标题翻译：在光纤传输系统中减少受激布里渊散射
公开(公告)号：US5329396A
公开(公告)日：1994-07-12
申请号：US967649
申请日：1992-10-28
申请人： Daniel A. Fishman , Jonathan A. Nagel , Yong-Kwan Park
发明人： Daniel A. Fishman , Jonathan A. Nagel , Yong-Kwan Park
IPC分类号： H01S3/10 , H04B10/02 , H04B10/18 , H04B10/12
CPC分类号： H04B10/2537 , H01S2301/02 , H01S2301/03
摘要： A technique for reducing the power threshold at which stimulated brillouin scattering ("SBS") occurs within an optical fiber by directly modulating a conventional laser generating an optical signal propagated along that fiber. The modulation is accomplished by employing an alternating waveform to induce a dither upon the laser output. The specific frequency of the alternating waveform is chosen to be very much lower than the low frequency cut-off of any receiver coupled to the optical fiber, but sufficiently high enough to efficiently suppress the Brillouin gain. This dithering causes the laser to be frequency modulated, thereby broadening the effective linewidth of the laser output and increasing the SBS power threshold.
摘要翻译：通过直接调制产生沿着该光纤传播的光信号的常规激光器来降低在光纤内发生受激布里渊散射（“SBS”）的功率阈值的技术。通过采用交替波形来在激光输出上引起抖动来实现调制。交替波形的特定频率被选择为非常低于耦合到光纤的任何接收器的低频截止，但足够高以有效地抑制布里渊增益。这种抖动使得激光器被调频，从而拓宽了激光输出的有效线宽并增加了SBS功率阈值。

8. 发明授权

US06839517B2 Apparatus and method for transmitting optical signals through a single fiber optical network 有权
标题翻译：用于通过单个光纤网络传输光信号的装置和方法
公开(公告)号：US06839517B2
公开(公告)日：2005-01-04
申请号：US09781571
申请日：2001-02-12
申请人： Felix C. Anigbo , Gerard Edmond Henein , Anpei Pan , Moon Soo Park , Yong-Kwan Park , John D. Weld
发明人： Felix C. Anigbo , Gerard Edmond Henein , Anpei Pan , Moon Soo Park , Yong-Kwan Park , John D. Weld
IPC分类号： G02B6/34 , G02B6/42 , H04J14/02 , H04B10/24
CPC分类号： G02B6/2938 , G02B6/29362 , G02B6/4246
摘要： An apparatus for wavelength multiplexing optical signals, wherein the apparatus includes at least one optically conductive sleeve, at least one collimating lens positioned to receive a optical signal from the at least one sleeve, and at least one dichroic splitter positioned to receive the optical signal from the at least one collimating lens. A filter may further be positioned to receive the optical signal from the at least one dichroic splitter in order to further filter the optical signal. The apparatus for wavelength multiplexing is configured to provide optical isolation of at least 75 dB via the combination of the at least one dichroic splitter and filter elements.
摘要翻译：一种用于波长复用光信号的装置，其中所述装置包括至少一个光导电套筒，至少一个准直透镜，定位成接收来自所述至少一个套筒的光信号，以及至少一个二向色分光器，其被定位成从所述至少一个准直透镜。还可以将滤波器定位成从至少一个二向色分光器接收光信号，以进一步滤光光信号。用于波长多路复用的装置被配置为通过至少一个二向色分离器和滤波器元件的组合提供至少75dB的光隔离。

9. 发明授权

US5825521A Method of determining inter-symbol interference in transmission systems 失效
标题翻译：确定传输系统中符号间干扰的方法
公开(公告)号：US5825521A
公开(公告)日：1998-10-20
申请号：US685641
申请日：1995-07-24
申请人： Kinichiro Ogawa , Yong-Kwan Park
发明人： Kinichiro Ogawa , Yong-Kwan Park
IPC分类号： H04B10/02 , H04B10/08 , H04B10/00
CPC分类号： H04B10/07953
摘要： A method of determining Inter-Symbol Interference (ISI) in transmission systems first measures, for each of a plurality of received signal having different Signal-to-Noise (S/N) ratio, the minimum Bit-Error Rate (BER) as a function of the threshold level of a decision circuit at the system receiver. The measurements are then repeated on the system or on a simulated system where one or more segments of the transmission facility has been replaced with one or more non-ISI producing attenuators. The ISI levels for a given BER value is determined from the first and second sets of measurements. An alternate method measures minimum BER values of the system and the simulated system, as a function of the received signal power, for received signals having different S/N ratios. The ISI levels for a given BER value is then determined from these two sets of measurements.
摘要翻译：确定传输系统中的符号间干扰（ISI）的方法首先针对具有不同信噪比（S / N）比的多个接收信号中的每一个测量最小比特误码率（BER）作为在系统接收机处的判定电路的阈值电平的功能。然后在系统或模拟系统上重复测量，其中传输设施的一个或多个段已被一个或多个非ISI产生衰减器替代。给定BER值的ISI电平由第一组和第二组测量确定。对于具有不同S / N比的接收信号，替代方法测量系统和仿真系统的最小BER值，作为接收信号功率的函数。然后，通过这两组测量确定给定BER值的ISI电平。

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