公开(公告)号：US20080181619A1

公开(公告)日：2008-07-31

申请号：US12017957

申请日：2008-01-22

申请人： Fred L. Heismann ,  Daniel Mahgerefteh ,  Parviz Tayebati

发明人： Fred L. Heismann ,  Daniel Mahgerefteh ,  Parviz Tayebati

IPC分类号： H04B10/04

CPC分类号： H04B10/25137 ,  H04B10/504

摘要： An optical transmitter is disclosed wherein a modulating signal, such as an NRZ signal, encoding data is combined with a time derivative of the modulating signal and coupled to a directly modulated laser in order to generate artificial transient chirp in the output of the laser effective to substantially compensate for dispersion experienced by the output of the laser traveling through a dispersive medium such as an optical fiber. In some embodiments, the time derivative is added to the modulating signal only at the falling edges of the modulating signal.

摘要翻译： 公开了一种光发射机，其中诸如NRZ信号的编码数据的调制信号与调制信号的时间导数组合并耦合到直接调制的激光器，以便在激光器的输出中产生人为瞬态啁啾， 基本上补偿了通过诸如光纤的分散介质传播的激光器的输出所经历的色散。 在一些实施例中，仅在调制信号的下降沿将时间导数添加到调制信号。

公开(公告)号：US20080166130A1

公开(公告)日：2008-07-10

申请号：US11897012

申请日：2007-08-28

申请人： Daniel Mahgerefteh ,  Parviz Tayebati

发明人： Daniel Mahgerefteh ,  Parviz Tayebati

IPC分类号： H04J14/02

CPC分类号： G02B6/4246 ,  G02B6/29365 ,  G02B6/2938 ,  H04J14/02

摘要： This invention provides a system that combines a wavelength multiplexer with an FM discriminator for chirp reduction and wavelength locker in a filter to produce a wavelength division multiplexed signal with reduced chirp. A partially frequency modulation laser signal is converted into a substantially amplitude modulation laser signal. This conversion increases the extinction ratio of the input signal and further reduces the chirp. A wavelength division multiplexing (WDM) method is used for transmitting high capacity information through fiber optics systems where digital information is carried on separate wavelengths through the same fiber. Separate transmitters normally generate their respective signals that are transmitted at different wavelengths. These signals are then combined using a wavelength multiplexer to transmit the high capacity information through the fiber optic system. Various technologies can be used to multiplex the signals such as, for example, thin film filters, or arrayed waveguide gratings. In a WDM system, a wavelength locker may also be used that fixes the center wavelength of a transmitter to a reference. Wavelength lockers may include etalons or fiber gratings, either of which provides a reference wavelength. A control circuit typically compares the wavelength of the transmitter to the reference. An error signal adjusts the transmitter format wavelength by varying temperature or by other means to keep it locked to the reference wavelength.

摘要翻译： 本发明提供一种将滤波器中的波长多路复用器与用于啁啾减少的FM鉴频器和波长锁定器组合以产生具有减少的线性调频脉冲的波分复用信号的系统。 部分频率调制激光信号被转换成大致幅度的调制激光信号。 该转换增加了输入信号的消光比，并进一步减少了啁啾。 波分复用（WDM）方法用于通过光纤系统传输高容量信息，其中数字信息通过相同光纤在不同的波长上传送。 分离的发射机通常产生其以不同波长传输的各自的信号。 然后使用波长多路复用器组合这些信号以通过光纤系统传输高容量信息。 可以使用各种技术来复用信号，例如薄膜滤波器或阵列波导光栅。 在WDM系统中，还可以使用将发射机的中心波长固定为参考的波长锁定器。 波长锁定器可以包括标准具或光纤光栅，其中任一个提供参考波长。 控制电路通常将发射机的波长与参考相比较。 错误信号通过改变温度或通过其他方式调整发射器格式波长，使其锁定到参考波长。

公开(公告)号：US20080158639A1

公开(公告)日：2008-07-03

申请号：US11977206

申请日：2007-10-24

申请人： Kevin McCallion ,  Daniel Mahgerefteh ,  Michael Deutsch ,  Parviz Tayebati

发明人： Kevin McCallion ,  Daniel Mahgerefteh ,  Michael Deutsch ,  Parviz Tayebati

IPC分类号： G02F1/01

CPC分类号： G02B6/4206 ,  G02B6/14 ,  G02B6/4215

摘要： An optical system comprising a frequency modulated laser source adapted to produce a frequency modulated optical beam, an optical spectrum reshaper (OSR) adapted to receive the frequency modulated optical beam from the laser source and convert it into an amplitude modulated optical beam, a focusing lens adapted to receive the amplitude modulated optical beam from the OSR and focus the same, and an optical fiber adapted to receive the amplitude modulated optical beam from the focusing lens and transmit an optical signal;characterized in that the OSR has a central axis, the focusing lens has a central axis, and the optical fiber has a central axis, with the central axis of the optical fiber being laterally offset from at least one of the central axis of the OSR and the central axis of the focusing lens so as to effect spatial filtering and thereby generate the desired optical transmission characteristics for the resulting optical signal in the optical fiber.

摘要翻译： 一种光学系统，包括适于产生调频光束的调频激光源，适于从激光源接收频率调制光束并将其转换成幅度调制光束的光谱整形器（OSR），聚焦透镜 适于接收来自OSR的幅度调制光束并对其进行聚焦;以及光纤，适于从聚焦透镜接收调幅光束并发射光信号; 其特征在于，所述OSR具有中心轴，所述聚焦透镜具有中心轴线，并且所述光纤具有中心轴线，所述光纤的中心轴线横向偏离所述OSR的中心轴线中的至少一个， 聚焦透镜的中心轴，从而实现空间滤波，从而产生光纤中产生的光信号所需的光传输特性。

公开(公告)号：US20060274993A1

公开(公告)日：2006-12-07

申请号：US11441944

申请日：2006-05-26

申请人： Daniel Mahgerefteh ,  Duncan Walker ,  Roeland Nuyts

发明人： Daniel Mahgerefteh ,  Duncan Walker ,  Roeland Nuyts

IPC分类号： G02B6/28

CPC分类号： G02B6/29358 ,  G02B5/288 ,  G02B6/29392 ,  G02B6/29394 ,  H04B10/25133

摘要： This invention provides a flat dispersion frequency discriminator (FDFD) capable of having a substantially flat dispersion with either a positive or negative dispersion along the spectrum region of the discriminator. This way, a FDFD may not cause substantial distortion of the intensity patter of its output to minimize the occurrence distortion due to overshooting or undershooting of the intensity pattern depending on the relative spectral alignment of the laser output relative to the filter transmission.

公开(公告)号：US06963685B2

公开(公告)日：2005-11-08

申请号：US10289944

申请日：2002-11-06

申请人： Daniel Mahgerefteh ,  Parviz Tayebati

发明人： Daniel Mahgerefteh ,  Parviz Tayebati

IPC分类号： G02B5/28 ,  G02B6/34 ,  H04B10/155 ,  H04B10/18

CPC分类号： H04B10/504 ,  G02B5/281 ,  G02B6/29358 ,  G02B6/29362 ,  G02B6/29394 ,  G02B6/29398 ,  H04B10/25133 ,  H04B10/58

摘要： This invention generally relates to an optical filter for a fiber optic communication system. An optical filter may be used, following a directly modulated laser source, and converts a partially frequency modulated signal into a substantially amplitude modulated signal. The optical filter may compensate for the dispersion in the fiber optic transmission medium and may also lock the wavelength of the laser source.

摘要翻译： 本发明一般涉及一种用于光纤通信系统的光学滤波器。 可以使用光滤波器，跟随直接调制的激光源，并将部分调频的信号转换成基本幅度调制的信号。 滤光器可以补偿光纤传输介质中的色散，也可以锁定激光源的波长。

公开(公告)号：US06940889B2

公开(公告)日：2005-09-06

申请号：US10084788

申请日：2002-02-26

申请人： Benjamin John Eggleton ,  Daniel Mahgerefteh ,  Paul Steinvurzel ,  Paul Stephen Westbrook

发明人： Benjamin John Eggleton ,  Daniel Mahgerefteh ,  Paul Steinvurzel ,  Paul Stephen Westbrook

IPC分类号： H01S5/024 ,  H01S5/062 ,  H01S5/0687 ,  H04B10/00 ,  H04B10/04 ,  H04B10/06 ,  H04B10/14 ,  H04B10/155 ,  H01S3/08

CPC分类号： H04B10/508 ,  H04B10/504 ,  H04B10/572

摘要： In accordance with the invention, a modulated RZ pulse source comprises a modulated light source optically coupled to a stabilized Bragg grating filter and one or more optical taps. The light source is preferably modulated in power and frequency and has an adjustable channel wavelength λ. The Bragg grating filter has a reflectivity bandwidth having a high slope reflectivity cutoff and is preferably tunable. A feedback arrangement responsive to the taps keeps the source channel wavelength λ on the edge of the reflectivity bandwidth for shaping RZ pulses. When the Bragg grating is stabilized, the feedback system maintains λ at a value linked to the grating reflectivity edge and, by overlapping at least part of the optical spectrum of the source, converts the modulated source light into RZ pulses with high extinction ratio (≧12 dB). The result is a high power, jitter-free RZ pulse source that is compact, inexpensive and power efficient.

摘要翻译： 根据本发明，调制的RZ脉冲源包括光耦合到稳定的布拉格光栅滤波器和一个或多个光学抽头的调制光源。 光源优选地在功率和频率上进行调制，并具有可调节的通道波长λ。 布拉格光栅滤波器具有高斜率反射截止的反射带宽，并且优选是可调谐的。 响应于抽头的反馈装置将源通道波长λ保持在反射带宽的边缘上，以形成RZ脉冲。 当布拉格光栅稳定时，反馈系统将λ维持在与光栅反射率边缘相关联的值，并且通过重叠光源的至少一部分光谱，将调制的源光转换成具有高消光比的RZ脉冲（> = 12dB）。 结果是高功率，无抖动的RZ脉冲源，紧凑，价格低廉，功率高。

公开(公告)号：US06335819B1

公开(公告)日：2002-01-01

申请号：US09506745

申请日：2000-02-18

申请人： Pak S. Cho ,  Julius Goldhar ,  Daniel Mahgerefteh

发明人： Pak S. Cho ,  Julius Goldhar ,  Daniel Mahgerefteh

IPC分类号： H01S300

CPC分类号： H04B10/299

摘要： The present invention provides simultaneous all-optical regeneration (re-shape and re-amplify) and wavelength conversion using a reverse-biased electroabsorption modulator. The nonlinear optical transmission characteristic of the electroabsorption modulator reshapes the degraded input data by selective absorption of the optical noise and, therefore, increases the signal-to-noise ratio of the output. Reverse biasing the modulator allows fast recovery of the optical absorption for high data-rate operation without the detrimental bit-patterning effect. Error-free wavelength conversion and regeneration at 20 Gb/s was obtained with more than 3-dB improvement of the receiver sensitivity at a bit-error-rate of 10−9. Embodiments and applications of the present invention include an all-optical SEAM regenerator, an all-optical distributed feedback laser SEAM (DFB-SEAM) regenerator, an all-optical SEAM with fiber Bragg grating (SEAM-FBG) regenerator, an all-optical SEAM with polarizing beam splitter (SEAM-PBS) regenerator, an all-optical Mach-Zehnder interferometric (MZI-SEAM) regenerator, an all-optical 3-port MZI-SEAM regenerator, and a SEAM-based optimized receiver.

摘要翻译： 本发明提供使用反向偏置电吸收调制器的同时全光学再生（重新形成和重新放大）和波长转换。 电吸收调制器的非线性光学传输特性通过选择性吸收光学噪声来重构劣化的输入数据，因此增加了输出的信噪比。 反向偏置调制器允许快速恢复光学吸收，用于高数据速率操作，而不会产生有害的位图案化效果。 获得20 Gb / s的无差错波长转换和再生，以10-9的误码率提高接收机灵敏度的3 dB以上。 本发明的实施例和应用包括全光学SEAM再生器，全光分布反馈激光器SEAM（DFB-SEAM）再生器，具有光纤布拉格光栅（SEAM-FBG）再生器的全光学SEAM，全光学 具有偏振分束器（SEAM-PBS）再生器的SEAM，全光学马赫曾德尔干涉（MZI-SEAM）再生器，全光学3端口MZI-SEAM再生器和基于SEAM的优化接收器。

公开(公告)号：US6104851A

公开(公告)日：2000-08-15

申请号：US65686

申请日：1998-04-24

申请人： Daniel Mahgerefteh

发明人： Daniel Mahgerefteh

IPC分类号： G02B6/34 ,  G02B6/42 ,  H01S5/14 ,  H04B10/155

CPC分类号： G02B6/29317 ,  H01S5/146 ,  H04B10/505 ,  H04B10/564 ,  H04B10/572 ,  G02B6/4215 ,  G02B6/4266

摘要： The optical signal produced by a modulated semiconductor laser is passed through a fiber grating optical discriminator to increase the modulation response of the device and decrease the output chirp for transmission through optical fiber.

摘要翻译： 由调制的半导体激光器产生的光信号通过光纤光栅鉴别器，以增加器件的调制响应，并减少用于通过光纤传输的输出线性调频脉冲。

公开(公告)号：US20100329666A1

公开(公告)日：2010-12-30

申请号：US12495460

申请日：2009-06-30

申请人： Xueyan Zheng ,  Jianying Zhou ,  Vincent Bu ,  Daniel Mahgerefteh

发明人： Xueyan Zheng ,  Jianying Zhou ,  Vincent Bu ,  Daniel Mahgerefteh

IPC分类号： H04B10/00

CPC分类号： H01S5/0427 ,  H01S5/02284 ,  H01S5/06837 ,  H01S5/0687

摘要： Thermal chirp compensation in a chirp managed laser. In one example embodiment, a method for thermal chirp compensation in a chirp managed laser (CML) includes several acts. First, a first bias condition and temperature is selected. Next, a first thermal chirp compensation signal is generated. Then, the laser is driven by biasing a first input drive signal with the first thermal chirp compensation signal. Next, a second bias condition and temperature is selected. Then, a second thermal chirp compensation signal is generated. Finally, the laser is driven by biasing a second input drive signal with the second thermal chirp compensation signal.

摘要翻译： 啁啾管理激光器中的热啁啾补偿。 在一个示例性实施例中，在线性调频管理激光器（CML）中用于热啁啾补偿的方法包括若干动作。 首先，选择第一偏置条件和温度。 接下来，产生第一热啁啾补偿信号。 然后，通过利用第一热啁啾补偿信号偏置第一输入驱动信号来驱动激光器。 接下来，选择第二偏置条件和温度。 然后，产生第二热啁啾补偿信号。 最后，通过利用第二热啁啾补偿信号偏置第二输入驱动信号来驱动激光器。

公开(公告)号：US20100008679A1

公开(公告)日：2010-01-14

申请号：US12171201

申请日：2008-07-10

申请人： Christopher R. Cole ,  Daniel Mahgerefteh ,  The'Linh Nguyen ,  Andrew C. Singer ,  Naresh Ramnath Shanbhag

发明人： Christopher R. Cole ,  Daniel Mahgerefteh ,  The'Linh Nguyen ,  Andrew C. Singer ,  Naresh Ramnath Shanbhag

IPC分类号： H04B10/12

CPC分类号： H04B10/58 ,  H04B10/40 ,  H04B10/532 ,  H04B10/5561 ,  H04B10/69

摘要： A high-speed optical transmitter comprises multiple digital lanes that are provided to a bank of digital-to-analog converters. The analog signals are then used to Phase Shift Keyed (PSK) modulation using a Chirp Managed Laser (CML)-based transmitter, and potentially using dual polarization. A corresponding optical receiver receives the sequence of optical signals at a demodulator. For each polarization, the demodulator includes a corresponding demodulation channel that is configured to demodulate that polarization component of the optical signal into one or more signal components. Each of these signal components is converted into a corresponding digital signal using a corresponding analog-to-digital converter. In the case of higher-order PSK modulation (e.g., 8PSK or higher), for each polarization, the analog converter has a lower sampling rate than for QPSK modulation.

摘要翻译： 高速光发射机包括提供给数模转换器组的多个数字通道。 然后使用基于啁啾管理激光（CML）的发射机将模拟信号用于相移键控（PSK）调制，并可能使用双极化。 相应的光接收机在解调器处接收光信号序列。 对于每个极化，解调器包括相应的解调信道，其被配置为将该光信号的偏振分量解调为一个或多个信号分量。 这些信号分量中的每一个都使用对应的模拟 - 数字转换器转换成相应的数字信号。 在高阶PSK调制（例如，8PSK或更高）的情况下，对于每个极化，模拟转换器具有比对QPSK调制低的采样率。