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US 2026/0045756 A1Published application
Fiber laser pumping of bismuth-doped O-band amplifier
AssigneeOFS Fitel, LLC
InventorsDavid J DiGiovanni, Vitaly Mikhailov
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Abstract
A Bismuth-doped fiber-optic amplifier (BDFA) system in which a Bismuth-doped optical fiber (BDF) is pumped by a fiber-laser pump (rather than by a semiconductor pump). Because higher-power fiber-laser pumps permit over-pumping of the BDF, there are benefits to the fiber-laser-pumped BDFA that cannot be realized with inherently lower-power semiconductor pumps.
Claims17
A bismuth-doped fiber amplifier (BDFA) system comprising:
- an amplification stage comprising:
- a fiber Bragg grating (FBG) comprising a reflectivity of approximately 99 percent (˜99%);
- a wavelength division multiplexer (WDM);
- and
- a bismuth-doped optical fiber (BDF) optically coupled between the FBG and the WDM, the BDF comprising:
- a BDF core having a diameter of approximately 8 micrometers (˜8 μm);
- a BDF cladding having a cladding diameter of ˜125 μm;
- a numerical aperture (NA) of approximately 0.13 (˜0.13);
- and
- a cutoff wavelength (λ) of approximately 1180 nanometers (˜1180 nm);
- a conversion stage configured to pump the BDF, the conversion stage comprising:
- a ten watt (10 W) rated multimode (MM) uncooled pump laser diode (LD) for providing pump light at an operating center λ of ˜915 nm, the 10 W-rated MM uncooled pump LD configured to operate at a threshold current of between approximately 510 milliamps (˜510 mA) and ˜630 mA, the 10 W-rated MM uncooled pump LD further configured to operate at a preferred operating temperature range of between approximately 20 degrees Celsius (˜20° C.) and ˜70° C., the 10 W-rated MM uncooled pump LD comprising a light-output-to-current-input-slope (LI-slope) efficiency of between ˜0.88 and ˜0.82;
- a high-reflection (HR) FBG optically coupled to the 10 W-rated MM uncooled pump LD, the HR FBG comprising an ˜99% reflectivity;
- a double-clad (DC) Ytterbium (Yb)-doped optical fiber (YDF) configured to convert the pump light from ˜915 nm to a center wavelength of ˜1150 nm to pump the BDF, the YDF comprising:
- an ˜6 μm-diameter YDF core;
- an ˜125 μm-diameter YDF inner cladding;
- a YDF input optically coupled to the HR FBG;
- and
- a YDF output;
- and
- an output coupler (OC) FBG optically coupled to the YDF output, the OC FBG further being optically coupled to the WDM, the OC FBG comprising an ˜75% reflectivity.
18 more elements
A forward-pumped bismuth-doped fiber amplifier (BDFA) system comprising:
- an amplification stage comprising:
- a bismuth-doped optical fiber (BDF) comprising:
- a BDF core;
- a BDF cladding;
- a BDF input;
- and
- a BDF output;
- and
- a wavelength division multiplexer (WDM) comprising:
- a WDM output optically coupled to the BDF input;
- and
- a WDM input at an amplification stage pump input;
- and
- a conversion stage for providing pump power to over-pump the amplification stage, the conversion stage comprising:
- apump laser diode (LD);
- a high-reflection (HR) fiber Bragg grating (FBG) optically coupled to the pump LD;
- a gain-doped optical fiber comprising:
- a gain-doped optical fiber input optically coupled to the HR FBG;
- and
- a gain-doped optical fiber output;
- and
- an output coupler (OC) FBG at a conversion stage output, the OC FBG being optically coupled between the gain-doped optical fiber output and the WDM input.
19 more elements
A backward-pumped bismuth-doped fiber amplifier (BDFA) system comprising:
- an amplification stage comprising:
- a bismuth-doped optical fiber (BDF) comprising:
- a BDF core;
- a BDF cladding;
- a BDF input;
- and
- a BDF output;
- and
- a wavelength division multiplexer (WDM) comprising:
- a WDM input optically coupled to the BDF output;
- and
- a WDM output at an amplification stage pump input;
- and
- a conversion stage for providing pump power to over-pump the amplification stage, the conversion stage comprising:
- a pump laser diode (LD);
- a high-reflection (HR) fiber Bragg grating (FBG) optically coupled to the pump LD;
- a gain-doped optical fiber comprising:
- a gain-doped optical fiber input optically coupled to the HR FBG;
- and
- a gain-doped optical fiber output;
- and
- an output coupler (OC) FBG optically coupled between the gain-doped optical fiber output and the WDM output.
19 more elements
Dependencies are inferred from the claim text.