Measurement of mode couplings and extinction ratios in polarization-maintaining fibers

Tsubokawa, Makoto; Higashi, Taishi; Sasaki, Yutaka

doi:10.1109/50.17731

Cited by 22 publications

(7 citation statements)

References 14 publications

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“…Therefore, compensation is conducted on selected data set which notably contributes to the cross-talk of the fiber. The selection mechanism is described in [9]. Fig.7.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Novel bidirectional path measurement of polarization cross-coupling distribution in PMF

et al. 2013

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The measurement accuracy of polarization cross-coupling strength based on white-light interferometry obviously decreases in long-distance polarization maintaining fiber (PMF), due to the difference of dispersion between two eigenmodes (birefringence dispersion). In this paper, we demonstrate a bidirectional measurement method with the scheme including a polarization maintaining coupler, a magnetic optical circulator and an Optical Coherence Domain Polarimeter (OCDP). The experiment setup and results are described in detail. The cross-coupling distribution results from each direction measurement were processed to mitigate the influence of dispersion. The compensation is conducted on coupling strength results, instead of raw interference signal in traditional method. The method saves the investigation of birefringence dispersion coefficient and light source parameters compared with compensation in frequency domain. Our experiment with a PMF coil of 200m length demonstrates the effectiveness in improving strength accuracy with absolute deviation less than 0.31dB, and spatial resolution recovered to 8.4cm.

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“…Therefore, compensation is conducted on selected data set which notably contributes to the cross-talk of the fiber. The selection mechanism is described in [9]. Fig.7.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Novel bidirectional path measurement of polarization cross-coupling distribution in PMF

et al. 2013

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“…It can be seen that the stress location is approximately linear to the degree of coherence. The error in this experiment is resulted from the polarization mode couplings at connectors due to angular misalignment [28], which interfere with the mode coupling arising from the stressed location, and add a cross talk to the stress-induced interference signal [29].…”

Section: Distributed Fiber Optic Stress Location Measurement With Socfmentioning

confidence: 97%

“…In this type of sensors, the stresses applied is kept small enough to ensure weak polarization mode coupling; otherwise, the coupled polarization mode at a stress-point may couple back to the other polarization mode at other stress-points. This kind of multiple coupling will result in cross talk between the coupled polarization modes arising from different locations along the fiber [29]. Under the weak coupling condition, the intensity of the round-trip coupled light is negligible.…”

Section: Unification Of Input and Output Ends Of Polarization-mode Comentioning

confidence: 98%

Unification of input and output ends in polarization-maintaining optical fiber stress sensor by synthesis of optical coherence function (Invited Paper)

Horie

Hotate

et al. 2005

SPIE Proceedings

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We have developed a functional distributed fiber-optic stress sensor by synthesis of the optical coherence function (SOCF). The technique determines the location of stress-induced polarization mode coupling in a polarizationmaintaining fiber (PMF) by measuring the optical path difference (OPD) between the fast mode and the slow mode in PMF with SOCF. By modulating the frequency of the lightwave from a super-structure-grating distributed Bragg reflector laser diode (SSG-DBR-LD) in a stepwise waveform, the coherence function is synthesized into a series of periodical peaks in the meaning of time-integration. The period is controlled to allow only one coherence peak enter the range of the PM fiber under test. Then we can measure the polarization mode coupling at the position corresponding to the peak. The position of the peak is adjusted by using a phase modulation proportional to the frequency modulation. Therefore, polarization mode coupling distribution along the fiber can be obtained. Up to date, one end of the sensing fiber is used as the input end, and the other as the output end. This scheme is generally not convenient for remote applications. In this presentation, we report two new effective methods that unify the input and the output to one end of the fiber. In one scheme, a mirror plus a polarizer is attached to the far end of the PM fiber. The other scheme employs a polarization beam splitter (PBS) attached to the far end of the PM fiber. The light beam output from the PBS in one polarization direction is fed back into the fiber through the PBS in the perpendicular polarization direction. Experimental demonstrations for both schemes are presented.

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“…Compared with other distributed detecting method, such as polarization optical time-domain reflectometry (POTDR) [3], optical frequency domain reflectometry (OFDR) [4] and optical coherence domain reflectometry ( OCDR) [5], OCDP shows outstanding advantages of simple structure, high spatial resolution(5~10cm), large measurement range(several kilometers), ultra-high measurement sensitivity(Coupling energy is about -80~-100dB) and ultra-large dynamic range(10 8~1 0 10 ).…”

Section: Introductionmentioning

confidence: 99%

Ultra-sensitivity, ultra-large dynamic all-fiber optical coherence domain polarimetry

et al. 2012

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An all-fiber optical coherence domain polarimetry (OCDP) is presented, which can increase the detection sensitivity and dynamic range simultaneously. The noise generation mechanism of OCDP and its impact have been studied, and the suppression method of interference beat noise transferred from light source intensity noise is presented. Using polarization beam splitter (PBS) instead of polarization-maintaining coupler, this method completely separated transmission and polarization coupling light in white light interference by optimizing the structure of the optical path. Thus, we can not only increase the signal amplitude of polarization crosstalk, and decrease the system noise. An all-fiber OCDP system has been built, and the detecting sensitivity of polarization crosstalk can reach -98dB, meanwhile, the dynamic range can keep in 98dB. This method realizes the highest performance of the date OCDP technology, and provides an effective measurement and evaluation tools for high performance fiber optic devices and sensor system.

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Measurement of mode couplings and extinction ratios in polarization-maintaining fibers

Cited by 22 publications

References 14 publications

Novel bidirectional path measurement of polarization cross-coupling distribution in PMF

Novel bidirectional path measurement of polarization cross-coupling distribution in PMF

Unification of input and output ends in polarization-maintaining optical fiber stress sensor by synthesis of optical coherence function (Invited Paper)

Ultra-sensitivity, ultra-large dynamic all-fiber optical coherence domain polarimetry

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