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Method, device, and system for realizing polarization mode dispersion compensation
A method, device, system for realizing polarization mode dispersion (PMD) compensation are provided. The method for realizing PMD compensation includes: de-multiplexing a polarization-multiplexed optical signal, to obtain a first polarization light and a second polarization light; and joint-equalizing the first polarization light and the second polarization light, to obtain a first...

Method and apparatus for broadband mitigation of polarization mode dispersion
Described is a method and system for reducing system penalty from polarization mode dispersion. The method includes receiving a plurality of signals at a receiving end of a transmission line, each signal being received on one of a plurality of channels of the transmission line and measuring a signal degradation of...

Photocurable coating composition
Disclosed is a photocurable coating composition for an optical fiber. The photocurable coating composition can be used to produce an optical fiber having a low polarization mode dispersion (PMD) even by a non-spinning process. The photocurable coating composition includes a photopolymerizable urethane acrylate oligomer, a reactive monomer, a photoinitiator and an...

High speed in-service optical network testing
A method may include generating a signal at an initiating device. A channel in an optical path may be identified, with the optical path including at least two spans. Simulated polarization mode dispersion (PMD) is injected into the signal to generate a test signal. The test signal is transmitted on the...

Measurement of polarization mode dispersion or differential group delay of an optical path
A method may include generating first and second optical signals and modulating the first and second optical signals simultaneously to synchronize the signals. The method may include varying the polarization of the second optical signal and transmitting the first and second optical signals. The method may include receiving the first and...

Systems and methods for polarization mode dispersion mitigation
In one exemplary embodiment, a method comprises transmitting an optical signal via the optical line, measuring a relative change in spectral intensity of the optical signal near a clock frequency (or half of that frequency) while varying a polarization of the optical signal between a first state of polarization and a...

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...

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Polarization Mode Dispersion patents

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