Axis alternation for signal propagation over polarization-maintaining fibers

Penninckx, D.; Beck, N.

doi:10.1109/lpt.2006.871818

Cited by 11 publications

(11 citation statements)

References 4 publications

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“…The interference condition is wavelength-dependent because it depends on the relative phase, which contributes Suppression of amplitude modulation induced by polarization mode dispersion 3 to DGD [10] . It should be mentioned that, if we consider the total energy on both axes, the temporal and frequency profiles of the signal would not be distorted because there is no power transfer between different wavelengths.…”

Section: Theory Of Pmd-induced Fm-to-am Conversionmentioning

confidence: 99%

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Suppression of amplitude modulation induced by polarization mode dispersion using a multi-degree-of-freedom fiber filter

Jiang

Qiao

et al. 2018

High Pow Laser Sci Eng

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Polarization mode dispersion (PMD) in fibers for high-power lasers can induce significant frequency modulation to amplitude modulation (FM-to-AM) conversion. However, existing techniques are not sufficiently flexible to achieve efficient compensation for such FM-to-AM conversion. By analyzing the nonuniform transmission spectrum caused by PMD, we found that the large-scale envelope of the transmission spectrum has more serious impacts on the amount of AM. In order to suppress the PMD-induced FM-to-AM conversion, we propose a novel tunable spectral filter with multiple degrees of freedom based on a half-wave plate, a nematic liquid crystal, and an axis-rotated polarizationmaintaining fiber. Peak wavelength, free spectral range (FSR), and modulation depth of the filter are decoupled and can be controlled independently, which is verified through both simulations and experiments. The filter is utilized to compensate for the PMD-induced FM-to-AM conversion in the front end of a high-power laser facility. The results indicate that, for a pulse with phase-modulation frequency of 22.82 GHz, the FM-to-AM conversion could be reduced from 18% to 3.2% within a short time and maintained below 6.5% for 3 h. The proposed filter is also promising for other applications that require flexible spectral control such as high-speed channel selection in optical communication networks.

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Section: Theory Of Pmd-induced Fm-to-am Conversionmentioning

confidence: 99%

“…The transfer function H PM ( f ) applied to the signal at the end of a single patch cord is then given by [10] 0…”

Section: Theory Of Pmd-induced Fm-to-am Conversionmentioning

confidence: 99%

Suppression of amplitude modulation induced by polarization mode dispersion using a multi-degree-of-freedom fiber filter

Jiang

Qiao

et al. 2018

High Pow Laser Sci Eng

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“…(1), it is a ratio between maximum power (P max ) and minimum power (P min ) both through a polarizer [1]. Typically, the acceptable PER is above 20 dB [2]- [3]. …”

Section: Introductionmentioning

confidence: 99%

Temperature dependency of Polarization Extinction Ratio in Polarization Maintaining Fiber with LC/UPC connectors

Thongdaeng¹,

Worasucheep

2016

2016 Photonics North (PN)

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This paper reports the temperature dependency of Polarization Extinction Ratio (PER) in Polarization Maintaining Fiber (PMF) with LC/UPC connectors. Ten LC/UPC PMF patchcords were PER measured under 3 testing conditions: A, B and C. Test A, patchcords were coiled on hot plate for 5 loops with 3-cm inner diameter and 4-cm outer diameter. The hot plate's temperature was increased from 25°C to 75°C and decreased back to 25°C at a step of 5°C. Test B, patchcords were coiled around hot rod with 3-cm in diameter for 5 loops. The hot rod's temperature was set in the same manner as Test A between 25°C to 100°C. In Test C, patchcords were uncoiled and left at room temperature while being PER measured for 15 minutes. From the sampled PER plots, small variations occur mainly at temperature transitions. The Standard Deviations (SDs) of PER confirm that their averages in Test A and B are nearly the same (0.30 -0.35), but larger than the average SDs in Test C (0.17 and 0.21). However, when only the PERs below 35 dB (according to OZ Optics ER-100-IR specification) at 75°C in Test A and B are computed, their average SDs reduce to 0.08 and 0.06 respectively. Hence, the hot rod at constant 75°C is chosen for future PER measurement because of its stable results in shortest time and simplified setup.

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“…Many researchers have tried kinds of methods to suppress the FM-to-AM effect. The polarizing fiber (PZF) is applied in Front-end system of NIF to eliminate the light along the unwanted axis [7], and in 2006, A. Jolly's group presented that the polarization-maintaining fiber (PMF) is employed in fiber injection system of LMJ to enhance the polarization extinction ratio (PER) over the propagation [8]. In 2011, Sébastien Vidal et al developed an interferometric filter based on PMF to precompensate nonlinear distortion of optical spectrum in process of frequency conversion, which reduce FM-to-AM modulations effectively [9].…”

Section: Introductionmentioning

confidence: 99%

Progress on the suppression of FM-to-AM modulations in SG-III laser facility

Zhang

Tian

et al. 2015

SPIE Proceedings

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FM-to-AM modulations are harmful to output characteristics of large-scale laser facility. In SG-III laser facility, some key techniques have been employed to suppress FM-to-AM modulations. Firstly, phase modulator was arranged at the end of fiber laser injection system to avoid GVD and PMD in the SM fiber system. Secondly, a fiber-based polarization rotated filter was proposed to suppress FM-to-AM modulations independently on each beam. Finally, less wave plates were employed and liquid crystal modulators were coated for decreasing weak etalon effect in preamplifier system. The results indicated that it can reduce the modulation depth less than 10% at a modulation frequency of 2.488GHz in SG-III laser facility.

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Axis alternation for signal propagation over polarization-maintaining fibers

Cited by 11 publications

References 4 publications

Suppression of amplitude modulation induced by polarization mode dispersion using a multi-degree-of-freedom fiber filter

Suppression of amplitude modulation induced by polarization mode dispersion using a multi-degree-of-freedom fiber filter

Temperature dependency of Polarization Extinction Ratio in Polarization Maintaining Fiber with LC/UPC connectors

Progress on the suppression of FM-to-AM modulations in SG-III laser facility

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