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We simulated the differential modal gain (DMG) property of WDM amplification characteristics for a ring-core erbium-doped fibre (RC-EDF) to clarify the possibility of an RC-EDF being used as a three- to five-signal LP-mode amplification medium. The authors defined two parameters, DMGYY-XX and WDGXX. The former and the latter are the difference between the gains of the LPXX mode and the LPYY mode at the shortest wavelength, and the gains of the LPXX mode at the shortest and longest wavelengths of WDM signal channel, respectively. XX and YY indicate the signal LP mode number. The authors present contour diagrams of the maximum DMGYY-XX and maximum WDGXX on the allowable three- to five-signal LP-mode areas of the RC-EDF. They confirm that it is possible to realise the amplification with a maximum DMGYY-XX of ≤2 dB, ≤1 dB, and about 2 dB for the 3, 4, and 5-LP modes and a maximum WDGXX of ≤ 1 dB for the three- to five-LP mode. The authors found that it is possible to realise an amplifier for 3-5 LP modes that operate with a relatively low DMG by using RC-EDF. [ABSTRACT FROM AUTHOR]

The first light source with a broadband spectrum in the 1800 nm wavelength region has been developed by employing a cascade configuration with a 1.65 μm band super luminescent diode and a Tm3+‐doped fibre amplification unit. The achieved bandwidth where the intensity exceeded ‐20 dBm/nm was 247 nm (from 1611 to 1858 nm) with a low ripple, whose peak‐to‐peak value was <0.15 dB. [ABSTRACT FROM AUTHOR]

Proposed is a multi‐core fibre amplification method that can reduce crosstalk, in which the optical amplified signals in two adjacent cores propagate in opposite directions. By employing the proposed method, confirmed is a crosstalk improvement of more than 4 dB using the outer six cores of a seven‐core erbium‐doped fibre. [ABSTRACT FROM AUTHOR]

A fan-in/fan-out device using small-diameter fibres for 12-core single-mode multicore fibre, which realises a hexagonal closely packed fibre arrangement by employing v-groove substrates and a low insertion loss is demonstrated. [ABSTRACT FROM AUTHOR]

The differential modal gain (DMG) in a few-mode erbium-doped fibre amplifier (FM-EDFA) is successfully improved by employing a ringcore FM erbium-doped fibre (RC-EDF). The DMGs between LP01 and LP11 mode signals in the FM-EDFA with the RC-EDF are 1.8 and 1.6 dB for LP01 and LP11 mode pumping, respectively, whereas those in a FM-EDFA with a conventional step-index FM EDF are 9.2 and 6.1 dB, indicating 7.4 and 4.5 dB DMG improvement for LP01 and LP11 mode pumping, respectively. [ABSTRACT FROM AUTHOR]

An inter-core crosstalk measurement method in a multi-core erbiumdoped fibre amplifier that uses a single-wavelength signal with multiple intensity tones is investigated. Its feasibility is confirmed and the output signal power dependence of the crosstalk values for the same signal gains between cores is successfully characterized. [ABSTRACT FROM AUTHOR]

An inter‐core crosstalk measurement method in a multi‐core erbium‐doped fibre amplifier that uses a single‐wavelength signal with multiple intensity tones is investigated. Its feasibility is confirmed and the output signal power dependence of the crosstalk values for the same signal gains between cores is successfully characterised. [ABSTRACT FROM AUTHOR]