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The polarization state law is a measure of single-mode fiber pmd an alternative test methods, and its measurement principle is: For a fixed input polarization state, when injected into the optical wavelength (frequency) change in the Stokes parameter space Li Bangjia ball measured fiber output polarization state (sop,) will evolve 更多：https://www.bmcx.com/ , they surround the axis coincident with the direction of the principal states of polarization (PSP), the rotation speed depends on the the pmd delay: delay the greater the faster the rotation. ⊿ by measuring changes in the corresponding angular frequency ω and on the Poincare sphere on behalf of the state of polarization (sop,) point the angle of rotation ⊿ θ, to calculate the the pmd delay δτ = ⊿ θ / ⊿ ω.

Polarization State method is measurement single die fibre PMD of 1th alternative test method, its measurement principle is: for fixed of entered polarization State, dang injection light wavelength (frequency) changes Shi, in Stokes parameter space in State plus ball Shang is measuring fibre output polarization State (SOP) also will occurs evolution 更多：https://www.bmcx.com/ , they around and main polarization State (PSP) direction coincidence of axis rotating, rotating speed depends on PMD delay: delay more large, rotating more fast. Change ⊿ by measuring the angular frequency ω and Gbarnga ball representative on polarization (SOP) ⊿ point of rotation angle θ, δ τ =| PMD can be calculated delay ⊿ θ/⊿ ω |.

Polarization is the measurement method of the single mode fiber PMD 1 alternative test method, the measurement principle is: for fixed input of polarization, when injected wavelength (frequency) changes, in the stokes parameter space on bangka ball measured optical output polarization state (SOP) will also happen evolution 更多：https://www.bmcx.com/ ,They surround and Lord (PSP) polarization direction coincide axis rotation, rotation speed depends on the PMD delay: the greater the delay, rotate faster. Through the measurement JiaoPinLv corresponding changes ⊿ ω and bond with the ball on behalf of polarization (SOP) point ⊿ rotation Angle θ, can compute δ τ = | PMD delay ⊿ θ / ⊿ ω |.

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