Topic
Mode scrambler
About: Mode scrambler is a research topic. Over the lifetime, 896 publications have been published within this topic receiving 13595 citations.
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Journal Article•
TL;DR: In this article, the internal structure of the spectrum arising from the generation of multiple longitudinal modes in a two-stage phosphosilicate Raman fiber laser was studied by the technique of rf beating in the output intensity.
Abstract: We have performed an experimental study of the internal structure of the spectrum arising from the generation of multiple longitudinal modes in a two-stage phosphosilicate Raman fiber laser. The mode structures and their interactions have been studied by the technique of rf beating in the output intensity. It is shown that the mode structure of the first Stokes wave copies the mode structure of the multimode pump laser and the mode structure of the second Stokes wave copies the mode structure of the first Stokes wave. The dependences of the amplitude and width for the rf resonances versus the pump power are discussed.
5 citations
Patent•
JDSU1
TL;DR: In this article, an optical amplifier having a suitable length of Er/Yb co-doped double-clad optical fiber is used to amplify an input optical signal, and a single mode signal launched from a single-mode laser pump co-propagates with the input optical signals in the core of the optical fiber.
Abstract: An optical amplifier having a suitable length of Er/Yb co-doped double clad optical fiber is used to amplify an input optical signal. The inner clad of the double clad optical fiber supports the propagation of a multi mode signal used to excite Er/Yb co-dopants in the double clad optical fiber. Simultaneously, a single mode signal launched from a single mode laser pump co-propagates with the input optical signal in the core of the optical fiber. In this model, single mode light travels in the single mode core region and the multi mode pump light is mainly in the clad region. The interaction between the two laser pumps is negligible.
5 citations
23 Jun 2013
TL;DR: Simulation results find that the combination of strong mode coupling and advanced detection schemes, such as maximum-likelihood (ML) detection can improve the system performance in the presence of MDL, however, the effectiveness of ML detection has to be traded off with its larger computational complexity compared to linear equalization such as minimum mean square error equalization.
Abstract: Mode-division multiplexing has emerged as an imminent step to increase the capacity of long-haul transmission systems and avoid the so-called “capacity crunch”. One way to realize such systems is by means of few-mode fibers (FMFs). One of the challenges that has to be addressed in order to implement FMF-based commercial systems is the mitigation of mode-dependent loss (MDL). All kinds of inline optical devices can attenuate or amplify the modes differently, leading to different performance among the modes. This paper presents simulations, which study the system MDL tolerance under the influence of mode coupling and possible methods to improve the performance of MDL-impaired systems. We find that the combination of strong mode coupling and advanced detection schemes, such as maximum-likelihood (ML) detection can improve the system performance in the presence of MDL. However, the effectiveness of ML detection has to be traded off with its larger computational complexity compared to linear equalization such as minimum mean square error equalization.
5 citations
TL;DR: A new technique is presented for observing the modal structure of a multimode fiber as a function of time, and the times of arrival of the modes are recorded with a temporal resolution of 0.03 psec.
Abstract: A new technique is presented for observing the modal structure of a multimode fiber as a function of time. The times of arrival of the modes are recorded with a temporal resolution of 0.03 psec, together with the mode patterns. The experiments were made on a fiber carrying less than 10 modes, and the length of the fiber under test was 1.5m.
5 citations
04 Mar 2012
TL;DR: In this article, the authors demonstrate simultaneous modal gains of 20dB for different pairwise combinations of spatial and polarization modes in a MM-EDFA, which are reduced by fiber design and control of the pump field distribution.
Abstract: We demonstrate simultaneous modal gains of ~20dB for different pair-wise combinations of spatial and polarization modes in a MM-EDFA. The differential modal gains are reduced by fiber design and control of the pump field distribution.
5 citations