Showing papers on "Polarization mode dispersion published in 1987"
TL;DR: In this article, the authors used multilongitudinal mode lasers to investigate the polarization properties of long lengths of single-mode fiber cable and found that the individual longitudinal modes are >99 percent polarized after propagation through 54.6 km of cabled fiber; however, the different longitudinal modes have different states of polarization at the output.
Abstract: We have used multilongitudinal mode lasers to investigate the polarization properties of long lengths of single-mode fiber cable. We find that the individual longitudinal modes are >99-percent polarized after propagation through 54.6 km of cabled fiber; however, the different longitudinal modes have different states of polarization at the output. This difference is caused by polarization dispersion, and we estimate a propagation delay difference for the two principal states of polarization to be 0.42 ps in the 54.6 km of cabled fiber.
53 citations
TL;DR: A new method for precisely aligning the principal axes between two birefringent fibers is presented using a Michelson interferometer and a broadband source, limited by the mode coupling produced near the connection with reduced dependence on the fiber crosstalk.
Abstract: A new method for precisely aligning the principal axes between two birefringent fibers is presented using a Michelson interferometer and a broadband source Angular alignment can be accomplished by measuring the interference peak value corresponding to the rotation angle between the principal axes of the birefringent fibers Angular alignment accuracy is limited by the mode coupling produced near the connection with reduced dependence on the fiber crosstalk Following the experiment, minimum angular misalignment was +/-0086 degrees , which corresponds to -56-dB crosstalk at the connection
25 citations
TL;DR: Chromatic dispersion of two orthogonal polarization modes has been investigated for various kinds of PANDA fibers and the zero-dispersion wavelength for the x-polarization mode was 6 nm shorter than that for the y-polarsization mode.
Abstract: Chromatic dispersion of two orthogonal polarization modes has been investigated for various kinds of PANDA fibers. In high-birefringence fiber with modal birefringence B = 7.9 × 10−4, the zero-dispersion wavelength for the x-polarization mode (λ0x = 1.307 μm) was 6 nm shorter than that for the y-polarization mode (λ0y = 1.313 μm). Chromatic dispersion of the fiber at 1.55-μm wavelength was σx = 18.3 psec/km-nm and σy = 16.1 psec/km-nm for the x- and y-polarization modes, respectively.
25 citations
TL;DR: In this paper, the influence of third-order dispersion effects on the generation of a train of ultrashort pulses in a single-mode fiber waveguide due to a self-modulation instability of a quasimonochromatic wave was investigated.
Abstract: A theoretical investigation is made of the influence of the third-order dispersion effects on the generation of a train of ultrashort pulses in a single-mode fiber waveguide due to a self-modulation instability of a quasimonochromatic wave. When the wavelength of this wave approaches a value corresponding to zero quadratic dispersion, the repetition frequency of the pulses can be increased considerably at a fixed value of the radiation power. The optimal range of modulation frequencies is found allowing for the cubic dispersion.
20 citations
01 Jan 1987
TL;DR: In this article, the polarization properties of ATT fiber were investigated using an elasto-optic point perturbation technique and a beat length of 6.78 ± 0.36 mm was measured directly at a wavelength of 1320 nm, inferring a phase index difference of 1.95 x 10 -4.
Abstract: An experimental study of the polarization properties of ATT this is due to the rectangular geometry of the fiber which facilitates winding and packaging the fiber with no perturbations. The polarization-holding parameter is 2.08 ± 0.09 x10 -6 m -1 . The state of polarization as a function of the input angle of the linear polarized field is determined for various lengths. For lengths ≥100m, depolarization effects eliminate all other states of polarization except the linear on-axis polarization state. For shorter lengths, other polarization states can propagate in the fiber; however, if the input angle of the field is within 5° of the polarization axis of the fiber only the linear on-axis polarization state will propagate in the fiber. Using an elasto-optic point perturbation technique, a beat length of 6.78 ± 0.36 mm was measured directly at a wavelength of 1320 nm, inferring a phase index difference of 1.95 x10 -4 .
5 citations
TL;DR: A novel optical fiber dispersion measurement technique using a streak camera is presented in this paper, where the relation of the group delay versus wavelength can be seen instantaneously without changing wavelength one after another.
Abstract: A novel optical fiber dispersion measurement technique using a streak camera is presented. The feature of the technique is that the relation of the group delay versus wavelength can be seen instantaneously without changing wavelength one after another. It is also presented that polarization mode dispersion and chromatic dispersion can be simultaneously obtained by using the technique.
5 citations
TL;DR: In this article, a simple analytical method to study birefringence and polarization mode dispersion of elliptic-core fibers with uniform or differential stress in the fiber cross section is presented.
Abstract: We present a simple analytical method to study birefringence and polarization mode dispersion (PMD) of elliptic-core fibers with uniform or differential stress in the fiber cross section. The model takes account of both geometrical and stress birefringence, simultaneously. It is found that neglecting the geometrical birefringence, even under the weakly guiding approximation, can lead to significant errors in the calculation of PMD and the zero PMD wavelength. It is also found that one can obtain zero PMD in the single-mode region even by applying a suitable differential stress along the major axis. This is very attractive since then the geometrical and stress birefringences add up to give increased total birefringence.
4 citations
01 Jan 1987
TL;DR: In this article, it was shown that in an axially symmetrical fiber, two mutually independent, circularly-polarized, clockwise and counter-clockwise rotating modes can be propagated.
Abstract: In ordinary axially-symmetrical single-mode fibers, two mutually-independent orthogonal HE11, modes can be propagated. In the framework of Cartesian coordinates, these are the HE11x mode which has the principal electric field component in the x-direction, and the HE11y, mode which has principally the y- component of the electncfield. We hereafter omit the suffix 11 for simplicity and call these HEx and HEy modes. On the other hand, any linearly-polarized HE11, mode can be expressed as a combination of two circularly-polarized, clockwise and counter-clockwise rotating HE11 modes. Hence, we may equivalently say that in an axially symmetrical fiber, two mutually-independent, circularly-polarized, clockwise and counter-clockwise rotating modes can be propagated. We hereafter call these clockwise and counter-clockwise HE11 modes the HE+ mode and HE− mode.
1 citations
19 Jan 1987
TL;DR: In this paper, a low loss and low dispersion in the 1.55-µm wavelength region is required for a PMF to maintain a state of polarization over a long length.
Abstract: Polarization-maintaining optical fiber (PMF), which maintains a state of polarization over a long length, has many applications from coherent transmission systems to fiber-optic sensors. Especially, in a long coherent transmission system, it is necessary that a PMF have low loss and low dispersion in the 1.55-µm wavelength region.1
Proceedings Article•
26 Apr 1987TL;DR: In this article, the authors proposed to use the nonlinearity of the refractive index, the Kerr effect, to balance the second-order dispersion in a single-mode silica fiber.
Abstract: In modern day low-toss single-mode fiber, the maximum information transmission rate is determined by chromatic dispersion At most carrier wavelengths, the pulse broadening dispersion effect can be adequately described by the second- order dispersion coefficient β″ = ∂2β/∂ω2, where β is the propagation constant One way to avoid spreading of the pulse transmitted by the fiber is to operate at the so-called zero dispersion wavelength, at which the second-order dispersion vanishes, β″ = 0 For silica fiber, this wavelength is 127 μm it can be shifted to 155 μm to take advantage of the minimum, fiber loss of 02 dB/km in specially designed fiber However, even at this wavelength, it has been shown1 that higher-order dispersion can cause significant pulse broadening Another method to counter the dispersion, proposed by Hasegawa and Tappert,2 is to make use of the nonlinearity of the refractive index, the Kerr effect, to balance the second-order dispersion Soliton pulses (or more precisely solitary waves) could then be generated which propagate without dispersive broadening Recent experiments3,4 have shown the feasibility of this idea by demonstrating the propagation of solitons in the anomalous dispersion region of a single-mode silica fiber However, whether such balance would occur between the nonlinearity and the higher-order dispersion at the zero dispersion wavelength is unclear
11 Mar 1987
TL;DR: Polarization retaining single-mode fibers are developed using the stress-rod approach in this article, where design parameter values have been varied to optimize birefringence, polarization holding, and low attenuation rates.
Abstract: Polarization retaining single-mode fibers are being developed using the stress-rod approach. Design parameter values have been varied to optimize birefringence, polarization holding, and low attenuation rates. Test configurations have been developed to characterize the fibers under simulated deployment bending conditions. The results show that good polarization and attenuation properties can be maintained for long lengths of fibers wound into compact sensor configurations.