Optimization of few-mode-fiber based mode converter for mode division multiplexing transmission

Xie, Yiwei; Fu, Songnian; Zhang, Minming; Tang, Ming; Shum, Perry Ping; Liu, Deming

doi:10.1016/j.optcom.2013.05.016

Cited by 12 publications

(4 citation statements)

References 13 publications

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“…According to the theory of optical waveguide, the normalized frequency of a 4-LP-mode FMF must satisfy the condition of 3.823 oVo5.136. Considering our fabricated FMF [20], the used FMF parameters for further calculation are summarized in table 1. The mode coupling between the 4 LP modes is very weak due to the large effective refractive index difference (Δn 40.5 Â 10 À 3).…”

Section: Resultsmentioning

confidence: 99%

Mode-dependent characteristics of Rayleigh backscattering in weakly-coupled few-mode fiber

Tang

et al. 2015

Optics Communications

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Section: Resultsmentioning

confidence: 99%

Mode-dependent characteristics of Rayleigh backscattering in weakly-coupled few-mode fiber

Tang

et al. 2015

Optics Communications

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“…We design and fabricate the FMF with step-index refractive index profile, which can support four-mode (LP 01 , LP 11 , LP 21 , and LP 02 ) transmission [20]. These fiber parameters determine the mode field pattern of the FMF, thus we can obtain l;m ðX ; Y Þ in (8).…”

Section: Simulation Resultsmentioning

confidence: 99%

A Robust Mode Converter Based on Liquid Crystal on Silicon (LCOS) With Off-Focus Operation

Tang

et al. 2015

IEEE Photonics J.

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We propose and experimentally demonstrate a robust mode converter based on liquid crystal-on-silicon (LCOS), which is not placed at the focal plane of the collimating lens. We present theoretical investigations to evaluate the performance of proposed configuration, and our experimental results verify the favorable function of mode-selective conversion with orthogonal linear polarizations, as well as two-mode multiplexing. The robust device configuration with an insertion loss of less than 3 dB, together with cascade capability, can be used for multidimensional fiber-optical transmission system. In particular, in terms of LP 11 mode conversion, the off-focus operation allows the range of position offset for input fiber with graded-index (GRIN) lens, LCOS, and few-mode fiber to be 7.5 mm, 151 m, and 40.4 mm, respectively, indicating easy alignment and maintenance.

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“…The FMF fabricated by our group is the four-mode weakly-coupled FMF with a step-index profile core 6 . In order to balance the mode coupling and the large effective area at the operation wavelength of 1.55μm, we choose the core radius, refractive index of core and cladding to be 9.5μm, 1.4615 and 1.45601, respectively.…”

Section: Design and Characteristics Of Fmfmentioning

confidence: 99%

Spatial mode rotator based on mechanically induced twist and bending in few-mode fibers

Tang

et al. 2015

SPIE Proceedings

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Recently, few-mode fiber (FMF) based mode division multiplexing (MDM) transmission together with multi-input multi-output (MIMO) signal processing technique is ideal candidate to solve future single mode fiber (SMF) capacity crunch. Most existing mode division multiplexers/demultiplexers (MMUX/DEMMUX) have a specific mode orientation for high-order non-circular symmetric mode. Taking the phase plate based DEMMUX as example and converting LP 11 mode to fundamental LP 01 mode, we need optimize input mode orientation the same as the phase pattern of phase plate. In this submission, we propose and experimentally demonstrate a spatial mode rotator based on mechanically induced twisting and bending in a step-index FMF. We theoretically find that the mode coupling strength between vector modes with similar propagation constants is determined by the FMF bending and twisting. When the input LP 11 mode cluster including TE 01 , HE 21a , HE 21b , and TM 01 mode are properly perturbed, the output optical field is superposed as LP 11 mode with a rotation. Therefore, the proposed spatial mode rotator is composed of three FMF coils with a radius of 16 mm, while the number of each coil is 2, 1, and 2, respectively. Consequently, we are able to rotate the LP 11 mode with arbitrary angle within 360º range using the same conventional configuration of polarization controller (PC). The insertion loss of proposed spatial mode rotator is less than 0.82 dB, when the operation wavelength varies from 1540 nm to 1560nm. In particular, from the measured mode profile, there exists little crosstalk between LP 01 mode and LP 11 mode during mode rotation operation.

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Optimization of few-mode-fiber based mode converter for mode division multiplexing transmission

Cited by 12 publications

References 13 publications

Mode-dependent characteristics of Rayleigh backscattering in weakly-coupled few-mode fiber

Mode-dependent characteristics of Rayleigh backscattering in weakly-coupled few-mode fiber

A Robust Mode Converter Based on Liquid Crystal on Silicon (LCOS) With Off-Focus Operation

Spatial mode rotator based on mechanically induced twist and bending in few-mode fibers

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