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Generation of a feedback signal for a polarization mode dispersion compensator in a communication system using alternate-polarization
The invention relates to a method of generating a feedback signal for adjusting a polarization mode dispersion compensator (PMDC, ) in a transmission system with alternate-polarization. A first signal () is determined by measuring a spectral component of the radio frequency modulation of an optical signal () at a particular radio...

Optical fiber coatings for reducing microbend losses
Certain embodiments of the invention may include systems and methods for providing optical fiber coatings to reduce microbend losses. According to an example embodiment of the invention, a method is provided for coating an optical fiber to reduce microbend losses and polarization mode dispersion (PMD). The method includes applying a primary...

Multicore optical fiber
The present invention relates to a multicore optical fiber having a structure for effectively inhibiting polarization mode dispersion from increasing, and the multicore optical fiber comprises a plurality of multicore units and a cladding region integrally covering the plurality of multicore units while separating the multicore units from each other. Each...

Optical node, optical network system, and method for measuring polarization mode dispersion
An optical node disposed along a transmission line that uses optical fiber. The optical node includes a first signal generator and a monitor. The first signal generator generates a first measurement signal for measuring polarization mode dispersion values and transmits the first measurement signal along the transmission line. The monitor detects...

Apparatus and method for compensating polarization mode dispersion
An apparatus (PMDC) for compensating polarization mode dispersion for an optical transmission fiber (TF) for transmission of optical signals, said optical signals having a first polarization component (x pol) and a orthogonal second polarization component (y pol) comprises tuneable means (PC, DL, PC, DL) adapted to compensating said fiber polarization mode...

Coherent optical receiver systems and methods
The present disclosure relates to coherent optical receiver systems and methods for determining and correcting for optical angle and magnitude imbalance and for delay imbalance between quadrature paths. The present invention iteratively determines and corrects imbalance error and differential delay entirely in the digital domain (after an analog to digital conversion)...

Timing recovery in presence of optical impairments and optimization of equalization based on timing recovery moment strengths
The present disclosure provides timing recovery in optical systems in the presence of chromatic dispersion (CD), polarization mode dispersion (PMD), and polarization dependent loss (PDL) and to optimization of equalization settings based upon timing recovery moment strengths. A stable timing point may be determined in the presence of PMD and PDL...

Method and apparatus for compensating polarization mode dispersion
Embodiments of the present invention provide a method and an apparatus for compensating polarization mode dispersion. The method mainly includes: extracting an SOP (state of polarization) and a PMD (polarization mode dispersion) value of an optical signal, generating an SOP control signal according to the SOP, and adjusting the SOP of...

In-service optical dispersion determining system and method
A system and method for in-service optical dispersion determination are provided. Optical dispersion is determined by splitting a first optical signal into two components, introducing a time delay between the two components such that corresponding pulses of the two components partially overlap, combining the two components to generate a combined optical...

System and method for frequency-domain chromatic dispersion and polarization mode dispersion compensation with time-domain channel estimation
A system and method are disclosed which compensate for chromatic dispersion and polarization mode dispersion in a digital signal. The signal is adjusted for chromatic dispersion in the frequency-domain. The signal is then converted to the time-domain and at least a portion of the signal is estimated to produce channel parameters....

Multi-stage polarization mode dispersion compensation
A polarization mode dispersion compensator that includes two stages, one for reducing or eliminating first order polarization mode dispersion of an optical signal, and second stage for reducing or eliminating higher order polarization mode dispersion of the optical signal. In each stage, the polarization is adjusted so as to reduce polarization...

Pmd-insensitive method of chromatic dispersion estimation for a coherent receiver
Consistent with the present disclosure, a method and system for estimating chromatic dispersion of an optical signal in a coherent receiver is provided that is insensitive to polarization mode dispersion (PMD) and other polarization effects in the optical communication system. The effects of chromatic dispersion in the optical system are estimated...

Method and system for a polarization mode dispersion tolerant optical homodyne detection system with optimized transmission modulation
An optical homodyne communication system and method in which a side carrier is transmitted along with data bands in an optical data signal, and upon reception, the side carrier is boosted, shifted to the center of the data bands, and its polarization state is matched to the polarization state of the...

Interferometer with a fiber optic having a high pmd in coupled mode, fiber optic gyroscope (fog), and inertial navigation system including such a gyroscope
Disclosed is a fiber optic interferometer including: a wideband optical source having a decoherence time τDC; a coil including N turns of a fiber optic with length L; an optical element separating the incident beam into first and second beams coupled to first and second ends of the fiber respectively, so...

Apparatus and method for monitoring an optical coherent network
An example method determines at an optical network monitoring device whether a value for at least one parameter that characterizes an optical signal which traverses a link of an optical coherent network is above a corresponding threshold and sets an alarm indicator when the value is larger than the corresponding threshold....

Adaptive pmd equalizer and implementation
Polarization mode dispersion (PMD) in a dual-pole optical communications network is compensated for using an adaptive PMD equalizer. The PMD equalizer may include a number of substantially identical filter modules that provide partial outputs which may be combined to form a PMD compensated output. A constant modulus algorithm (CMA)-based equalizer may...

Digital demodulator architecture
Methods, systems, and devices are described for a digital demodulator device for processing received optical signals. The device may include a quadrature error filter that receives a digitized version of an optical signal, and removes quadrature errors to generate a filtered series of data samples. The device may also include a...

Liquid crystal optical device configured to reduce polarization dependent loss and polarization mode dispersion
An LC-based optical device compensates for differences in optical path lengths of polarization components of input beam. As a result, PDL and PMD of the optical device are reduced. The compensation mechanism may be a glass plate that is disposed in an optical path of a polarization component so that the...

Pmd and chromatic dispersion tolerant clock recovery
Consistent with the present disclosure, a method and system for detecting a clock phase of an optical signal in a coherent receiver is provided that is insensitive to polarization mode dispersion (PMD) and other polarization effects in the optical communication system. The clock phase of the received signal is estimated by...

System for monitoring all-optical polarization having a contra-propagating pump beam
The present invention relates to a system () for stabilizing the polarization of an input light beam (), including a means () for optically guiding the input light beam (). In said system, the optical guide means () has Kerr nonlinearity and low polarization mode dispersion. Additionally, said system () also...

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Polarization Mode Dispersion patents



      
           
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