Power-equalizing multi-channel fiber laser array
OwnerHsien-Kuei Liao, Pie-Yau Chien +2inventors
InventorsHsien-Kuei Liao, Pie-Yau Chien, Hong-Yih Tseng, Sien Chi
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Abstract
The present invention provides a power-equalizing multi-channel fiber laser array, which comprises a pumping laser source, a 1×N ratio splitter, a plurality of WDM couplers, some pieces of EDFs, some pieces of fiber grating pairs, and a power-equalizing device (which may include variable optical attenuators). The power-equalization approach is realized by: (1) adding in some variable optical attenuators; (2) controlling the pumping power ratio to the individual channels by a 1×N variable ratio splitter; (3) adjusting the fiber lengths or the Er3+ concentration; or (4) adjusting the fiber gratings reflectivity.
Claims9
A reverse calculation method, wherein the unmodified output result of multi-channel sources are first found out with unequal power, and the pumping power ratio, the EDF length, the Er3+ concentration, or the grating reflectivity is then adjusted one by one to equalize the powers among channels.
A power-equalizing multi-channel fiber laser array comprising a pumping laser source, 1×N variable ratio splitter, a power-equalizing device (which may include N variable optical attenuators or nothing), a plurality of VDM couplers, a plurality of erbium-doped fibers, and a plurality of pairs of fiber gratings, laser light of said pumping source being split by said 1×N ratio splitter and then coupled to said WDM couplers, each resonance cavity including a pair of fiber gratings and a piece of erbium-doped fiber;
- whereby multi-channel light sources can be obtained, and said power-equalizing device or cavity parameters can be used to equalize said multi-channel light sources.
Dependencies are inferred from the claim text.