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Equilibrium mode distribution

About: Equilibrium mode distribution is a research topic. Over the lifetime, 928 publications have been published within this topic receiving 14939 citations.


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Journal ArticleDOI
TL;DR: Based on the mode coupling theory, a TE01-TM11 mode converter was designed and optimal results were obtained in this paper, where the bandwidth of the mode converter with axis exponential structure is the largest, and the mode converter with axis sinusoidal structure was the most compact in the case of the center frequency is 28GHz and the waveguide radius is 16mm.
Abstract: Based on the mode coupling theory, a TE01—TM11 mode converter was designed and optimal results were obtained. In this paper, bandwidth of mode converter with axis exponential structure is the largest, and mode converter with axis sinusoidal structure is the most compact in the case of the center frequency is 28GHz and the waveguide radius is 16mm. If the bending angle between input port and output port of mode converter was demanded for 90°, mode converter with axis parabola structure had the characteristics of compact structure, higher mode purity and larger relative bandwidth. Meanwhile, we found that the converter could be also used as TE11 mode transition with transmission efficiency above 99%. But due to bending angle of this structure was restricted, its center frequency and waveguide radius had the obvious corresponding relation.

8 citations

Patent
21 Jul 2009
TL;DR: In this paper, multiple resonator fiber optic gyroscope configurations comprising one or more mode filters inside the resonator are adopted to effectively suppress unwanted high order spatial modes which can be a significant source of gyro bias errors.
Abstract: Multiple resonator fiber optic gyroscope (RFOG) configurations comprising one or more mode filters inside the resonator are adopted to effectively suppress unwanted high order spatial modes which can be a significant source of gyro bias errors. The resonator comprises at least a loop fiber, either two or more in/out coupling elements, and connectors that link elements into a circulating loop. Directional elements may be used to separate output light from input light in some of the embodiments. In all embodiments, mode filters are placed in the resonator to guarantee that the light reaching the photodetector is filtered by at least one mode filter in the resonator at least once. The mode filters may contain both spatial mode filters (such as single mode fibers or waveguides) and polarization mode filters (such as polarizing elements) so that both spatial and polarization mode filtering can be implemented simultaneously.

8 citations

Patent
25 Aug 1978
TL;DR: In this paper, the authors proposed to realize the optical communication line of a wide transmission band width substantially equal to that of a single mode fiber by using the mode filter of the simple construction.
Abstract: PURPOSE:To realize the optical communication line of a wide transmission band width substantially equal to that of a single mode fiber by using the mode filter of the simple construction. CONSTITUTION:When the value of the standardized frequency V of a linear multimode optical fiber is larger than 2.4, the effect of confinement of the basic mode into the core is large and the intensity of the basic mode at the boundary of the core and clad becomes weak. Hence, it becomes difficult to receive the effect of disturbances at the boundary of the core and clad and the losses become smaller as against various bendings occuring in cabling and laying. Hence, the single mode is substantially made possible by adding a mode filter 4 function near the receiving end of an optical fiber 5.

8 citations

Journal ArticleDOI
TL;DR: In this article, the spectral analysis of the optical power transmitted through a bow tie slit rotating in the far-field pattern of a single-mode fiber provides an easy and accurate mean of determining the effective cutoff wavelength of the fiber.
Abstract: The spectral analysis of the optical power transmitted through a bow tie slit rotating in the far-field pattern of a single-mode fiber provides an easy and accurate mean of determining the effective cutoff wavelength of the fiber. The principle of this technique is described. Theoretical considerations show that the ratio between the optical powers carried by the LP/sub 11/ mode and the fundamental mode, respectively, is directly related to the amplitude of two particular lines in the spectrum. The degree of coherence of the analyzed field is shown to be related to the amplitude of a third line. Owing to the sensitivity of the method, the detectable amount of the total power which is contained in the LP/sub 11/ mode is as small as 0.5%. The effects of length and curvature on the effective cutoff wavelength are measured over wide ranges for different kinds of single-mode fibers. The behavior of a quadruple-clad flattened dispersion fiber is shown to be somewhat different from that of a typical depressed cladding fiber. >

8 citations

Proceedings ArticleDOI
01 Jul 1997
TL;DR: In this paper, the authors developed a theory of rational mode-locked fiber laser and compared the results with experimental results obtained from a 1.5 (mu) fiber laser with a LiNbO3 electro-optic phase modulator.
Abstract: Optical pulse sources with repetition rate approaching terahertz are very important for many photonics applications including ultra-high speed optical communication and generation of sub-mm waves. Both active and passive mode locked fiber lasers are the appropriate choice for this purpose because of the availability of erbium doped fiber amplifier. In general, the mode locking occurs with a repetition rate of nf0, where n is an integer and f0 is the longitudinal mode frequency spacing. This is called harmonic mode locking. In the case of rational harmonic mode locking, the repetition rate is (np plus 1) f0 where p is also another integer. For the case of active mode locking, this is obtained when the modulation frequency to the amplitude or phase modulator used for mode locking is given by (n plus 1/p) f0. For the case of passive mode-locking, the rational harmonic mode-locking occurs when the saturable absorber in a ring laser is offset by a fraction p/L: from the center where L is the length of the cavity. We have developed a theory of the rational mode locked fiber laser. The results of the theory are compared with experimental results obtained from a 1.5 (mu) fiber laser actively mode-locked with a LiNbO3 electro-optic phase modulator.© (1997) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

8 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20235
202212
20218
20205
20191
20183