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公开(公告)号：US20130163986A1
公开(公告)日：2013-06-27
申请号：US13641078
申请日：2011-04-15
IPC分类号： H04B10/2507
CPC分类号： H04B10/69
摘要： The present application describes methods and systems that improve the optical signal to noise ratio performance of an optical network without the need to vary the free spectral range associated with a differential interferometer. This is achieved by varying an electrical bandwidth of an electronic device associated with the receiver. For example, the electrical bandwidth may vary in inverse proportion to the combined effective optical bandwidth of the transmission line carrying the optical signal. The techniques described herein a applicable to a wide variety of modulation formats, including mPSK, DPSK, DmPSK, PDmPSK, mQAM, ODB, and other direct-detection formats. Using the techniques described herein, the optical signal to noise ratio and bit error ratio performance of the optical network is improved without the need to provide costly and complex differential interferometers whose free spectral range is variable.
摘要翻译： 本申请描述了改进光学网络的光信噪比性能的方法和系统，而不需要改变与差分干涉仪相关联的自由光谱范围。 这通过改变与接收器相关联的电子设备的电带宽来实现。 例如，电带宽可以与携带光信号的传输线的组合有效光带宽成反比变化。 本文描述的技术适用于包括mPSK，DPSK，DmPSK，PDmPSK，mQAM，ODB和其他直接检测格式的各种调制格式。 利用这里描述的技术，改善了光网络的光信噪比和比特误差比性能，而不需要提供昂贵和复杂的差分干涉仪，其自由光谱范围是可变的。
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公开(公告)号：US07949261B2
公开(公告)日：2011-05-24
申请号：US11740212
申请日：2007-04-25
IPC分类号： H04B10/06
CPC分类号： H04B10/505 , H04B10/5051 , H04B10/5055 , H04B10/5162 , H04B10/5561 , H04B10/66
摘要： An optical receiver includes a demodulator having a delay interferometer comprising an optical input that receives a phase modulated optical signal from a bandwidth limited transmission system. The delay interferometer has a free spectral range that is larger than a symbol rate of the phase modulated optical signal by an amount that improves receiver performance. The receiver also includes a differential detector having a first and a second photodetector. The first photodetector is optically coupled to the constructive optical output of the delay interferometer. The second photodetector is optically coupled to the destructive optical output of the delay interferometer. The differential detector combines a first electrical detection signal generated by the first photodetector and a second electrical detection signal generated by the second photodetector to generate an electrical reception signal.
摘要翻译： 光接收机包括具有延迟干涉仪的解调器，该延迟干涉仪包括从带宽限制传输系统接收相位调制光信号的光输入端。 延迟干涉仪具有大于相位调制光信号的符号率的自由频谱范围，改善接收机性能的量。 接收机还包括具有第一和第二光电检测器的差分检测器。 第一光电检测器光学耦合到延迟干涉仪的结构化光输出。 第二光电探测器光耦合到延迟干涉仪的破坏性光输出。 差分检测器组合由第一光电检测器产生的第一电检测信号和由第二光电检测器产生的第二电检测信号以产生电接收信号。
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公开(公告)号：US20070196110A1
公开(公告)日：2007-08-23
申请号：US11740212
申请日：2007-04-25
IPC分类号： H04B10/00
CPC分类号： H04B10/505 , H04B10/5051 , H04B10/5055 , H04B10/5162 , H04B10/5561 , H04B10/66
摘要： An optical receiver includes a demodulator having a delay interferometer comprising an optical input that receives a phase modulated optical signal from a bandwidth limited transmission system. The delay interferometer has a free spectral range that is larger than a symbol rate of the phase modulated optical signal by an amount that improves receiver performance. The receiver also includes a differential detector having a first and a second photodetector. The first photodetector is optically coupled to the constructive optical output of the delay interferometer. The second photodetector is optically coupled to the destructive optical output of the delay interferometer. The differential detector combines a first electrical detection signal generated by the first photodetector and a second electrical detection signal generated by the second photodetector to generate an electrical reception signal.
摘要翻译： 光接收机包括具有延迟干涉仪的解调器，该延迟干涉仪包括从带宽限制传输系统接收相位调制光信号的光输入端。 延迟干涉仪具有大于相位调制光信号的符号率的自由频谱范围，改善接收机性能的量。 接收机还包括具有第一和第二光电检测器的差分检测器。 第一光电检测器光学耦合到延迟干涉仪的结构化光输出。 第二光电探测器光耦合到延迟干涉仪的破坏性光输出。 差分检测器组合由第一光电检测器产生的第一电检测信号和由第二光电检测器产生的第二电检测信号以产生电接收信号。
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公开(公告)号：US07366425B2
公开(公告)日：2008-04-29
申请号：US10386359
申请日：2003-03-11
IPC分类号： H04B10/04
CPC分类号： H04B10/50575 , H04B10/505 , H04B10/5162 , H04B10/5165 , H04B10/5167
摘要： Different techniques for generating spectrally efficient carrier-suppressed modulated optical signals, also known as “phase-shaped binary transmission” (PSBT) signals, employ electrical components that generate only 2-level or binary signals, in contrast to techniques that require 3-level electrical drivers. The PSBT modulators can be used with return-to-zero (RZ) modulators for generating RZ-PSBT signals, which have the characteristic of even greater spectral efficiency than NRZ PSBT signals. The technique is generalized to RZ signals with an arbitrary phase difference between pulses. These signals can be generated by shifting the central (carrier) frequency of an RZ modulated optical signal, which can be done using a certain phase modulation or using spectral filtering with a passband offset from the center (carrier) frequency of the modulated optical signal, and the signals can also be generated by phase modulation at a frequency lower than the signaling rate of the modulated signal.
摘要翻译： 用于产生频谱效率高的载波抑制调制光信号的不同技术也称为“相位二进制传输”（PSBT）信号，采用仅产生2电平或二进制信号的电气部件，与需要3级 电动司机。 PSBT调制器可以与返回零（RZ）调制器一起使用，用于产生RZ-PSBT信号，其具有比NRZ PSBT信号更高的频谱效率的特性。 该技术被推广到具有脉冲之间的任意相位差的RZ信号。 这些信号可以通过移位RZ调制光信号的中心（载波）频率来产生，这可以使用一定的相位调制或使用具有从调制的光信号的中心（载波）频率的通带偏移的频谱滤波， 并且信号也可以通过低于调制信号的信号速率的频率的相位调制来产生。
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