公开(公告)号：WO2013020121A1

公开(公告)日：2013-02-07

申请号：PCT/US2012/049662

申请日：2012-08-03

Applicant: OFS FITEL, LLC ,  MIKHAILOV, Vitaly ,  WESTBROOK, Paul, S.

Inventor： MIKHAILOV, Vitaly ,  WESTBROOK, Paul, S.

IPC: G01J4/04

CPC classification number: G01J4/04 ,  G01J1/0425 ,  G01M11/337 ,  G01M11/35 ,  G02B6/02076 ,  G02B6/024

Abstract: An in-line polarization extinction ratio (PER) monitor that generates a value of an optical signal's PER from a single measurement, without requiring the optical transmission signal path of the system to be directly coupled into a separate measurement device. The polarization extinction ratio may be defined as: 1010g(P Ex /P Ey ), where P Ex is the power of the optical signal propagating along the "x axis" and P Ey is the power propagating along the orthogonal "y axis" (with the z-axis defined as a longitudinal optical axis of the system and the x-y plane orthogonal to this direction of propagation). The PER monitor comprises a section of optical fiber (preferably birefringent or with induced birefringency), with a pair of gratings formed along the fiber and oriented to out-couple orthogonal components of the propagating signal. Photodetectors are used to convert the scattered light into electrical signal equivalents and then processed to yield the PER value.

Abstract translation: 线性偏振消光比（PER）监视器，其从单个测量产生光信号的PER值，而不需要将系统的光传输信号路径直接耦合到单独的测量装置中。 偏振消光比可以定义为：1010g（PEx / PEy），其中PEx是沿着“x轴”传播的光信号的功率，而PEy是沿着正交“y轴”传播的功率（z- 轴定义为系统的纵向光轴和与该传播方向正交的xy平面）。 PER监测器包括一段光纤（优选双折射或具有诱导双折射），一对光栅沿着光纤形成并且定向成输出传播信号的正交分量。 光检测器用于将散射光转换为电信号等效物，然后进行处理以产生PER值。

公开(公告)号：WO2012154703A1

公开(公告)日：2012-11-15

申请号：PCT/US2012/036856

申请日：2012-05-07

Applicant: OFS FITEL, LLC ,  MIKHAILOV, Vitaly ,  WESTBROOK, Paul, S.

Inventor： MIKHAILOV, Vitaly ,  WESTBROOK, Paul, S.

IPC: H04B10/12

CPC classification number: H04B10/07951 ,  H04B10/0775 ,  H04B2210/07

Abstract: A method and system for measuring chromatic dispersion, experienced by ASK/PSK modulated optical signals, are provided. Dispersion measurement is enabled either by encoding an additional overhead at lower baud rate or by monitoring signal SOP or RF spectrum of signal SOP. The bulk chromatic dispersion of the link is measured by analyzing the dispersion broadening of the overhead constellation or signal temporal diagram, or time-overlapped signal diagram, or overhead spectrum. This information is used to reduce the computation time required for electronic recovery of a highly dispersed signal.

Abstract translation: 提供了用于测量由ASK / PSK调制的光信号所经历的色散的方法和系统。 通过以较低波特率编码附加开销或通过监视信号SOP的信号SOP或RF频谱来启用色散测量。 通过分析开销星座或信号时间图或时间重叠信号图或架空频谱的色散扩展来测量链路的体色散。 该信息用于减少电子恢复高分散信号所需的计算时间。

公开(公告)号：WO2018187806A1

公开(公告)日：2018-10-11

申请号：PCT/US2018/026713

申请日：2018-04-09

Applicant: OFS FITEL, LLC

Inventor： DIGIOVANNI, David, J. ,  INNISS, Daryl ,  MANGAN, Brian ,  MIKHAILOV, Vitaly ,  PACINI, John, E. ,  KREMP, Tristan

IPC: G02B6/028 ,  G02B6/02 ,  G02B6/036 ,  G02B6/26

Abstract: A hollow core optical fiber and cable combination is configured to exhibit minimal SNR and loss degradation. This is achieved by either: (1) reducing the coupling between the fundamental and other (unwanted) modes propagating within the hollow core fiber; or (2) increasing the propagation loss along the alternative. The first approach may be achieved by designing the cable to minimize perturbations and/or designing the hollow core fiber to fully separate the fundamental mode from the unwanted modes so as to reduce coupling into the unwanted modes. Whether through fiber design or cable design, the amount of light coupled into unwanted modes is reduced to acceptable levels. The second approach may be realized through either fiber design and/or cable design to suppress the light in unwanted modes so that an acceptably low level of light is coupled back into the fundamental mode.

公开(公告)号：WO2021055844A1

公开(公告)日：2021-03-25

申请号：PCT/US2020/051623

申请日：2020-09-18

Applicant: OFS FITEL, LLC

Inventor： INNISS, Daryl ,  MIKHAILOV, Vitaly

IPC: H01S3/067 ,  H04J14/02

Abstract: A system (e.g., an optical amplifier) comprising gain fibers (e.g., Bismuth-doped optical fiber) for amplifying optical signals. The optical signals have an operating center wavelength (λ0) that is centered between approximately 1260 nanometers (~1260nm) and ~1360nm (which is in the O-Band). The gain fibers are optically coupled to pump sources, with the number of pump sources being less than or equal to the number of gain fibers. The pump sources are (optionally) shared among the gain fibers, thereby providing more efficient use of resources.

公开(公告)号：WO2020056264A1

公开(公告)日：2020-03-19

申请号：PCT/US2019/051024

申请日：2019-09-13

Applicant: OFS FITEL, LLC

Inventor： LUO, Jiawei ,  MIKHAILOV, Vitaly

IPC: H01S3/06 ,  H01S3/063 ,  H01S3/16 ,  C03C4/12 ,  G02F1/39

Abstract: Bismuth (Bi) doped optical fibers (BiDF) and Bi-doped fiber amplifiers (BiDFA) are shown and described. The BiDF comprises a gain band and an auxiliary band. The gain band has a first center wavelength (λ1) and a first six decibel (6dB) gain bandwidth. The auxiliary band has a second center wavelength (λ2), with λ2 > λ1. The system further comprises a signal source and a pump source that are optically coupled to the BiDF. The signal source provides an optical signal at λ1, while the pump source provides pump light at a pump wavelength (λ3).