We report the optical architecture, experimental performance, and simulated performance of polarization- maintaining CW and pulsed single clad Tm-doped fiber amplifiers designed to operate over a wavelength span of 1760—1960 nm. We highlight the potential applications of these amplifiers to quantum computing and quantum qubit experiments using 1762 nm light. Our amplifier exhibits 3 W CW output power and 20 W peak pulsed output power (2 MHz rep. rate, 10% duty cycle) at 1762 nm. Measurements of the wavelength response of the TDFA yield an experimental operating bandwidth extending from < 1750 nm to > 1920 nm. Simulations of the amplifier bandwidth indicate a 3 dB (50% FWHM) wavelength span of 1745 nm to 1980 nm (135 nm). Experimental output power and bandwidth results agree well with the simulations. The external noise figure for this amplifier ranges from 7.5 dB to 9.5 dB. No linewidth broadening was observed in a typical TDFA output when using a single frequency input laser source with a linewidth of 10 kHz. We discuss suitability and applications of the TDFA to 1762 nm enabled manipulation of optical qubits in trapped 133Ba+ ions.
We demonstrate ASE pumping of rare-earth-doped fiber amplifiers, fiber lasers, and broadband ASE sources. Pumping with an ASE source yields the advantages of optical-optical efficiencies comparable to conventional pumps, generation of ultra-broad-band ASE sources, and reduced low frequency noise transferred from the pump to the signal.
We present the design and experimental and simulated results for a 2050 nm band fiber amplifier with high optical-optical slope efficiency and low ion pairing, using a novel high performance single clad Ho-doped fiber from the Naval Research Laboratory (NRL). We report a measured optical-optical slope efficiency of 57% using 1 mW input signal power and 1860 nm pumping which we believe is the highest slope efficiency measured to date for a single clad copumped HDFA. This efficiency is linked to a low ion pairing coefficient of 4% in the doped fiber derived from our data.
We present the design and performance of novel, highly stable, broadband, packaged single mode Tm-doped and Ho-doped ASE sources in the 2000 nm spectral band. Centroid wavelengths of 1850–1900 nm are achieved for Tm-doped sources and ~2070 nm for Ho-doped sources. Measured -10 dB spectral bandwidths exceed 100 nm for the Tm-doped sources and 60 nm for the Ho-doped sources. Output powers for two stage Tm-doped sources exceed 1 W CW.
Coherent nanosecond pulses with high peak powers in the 2μm region are in demand for applications such as LIDAR and atmospheric sensing. In this paper we present a PM pulsed laser based on a MOPA configuration providing up to 50W of peak power. The 2039nm seed laser is a pre-amplified DFB-FBG laser with <10kHz linewidth. Nanosecond pulses produced by an acousto-optic modulator are amplified by a single booster stage amplifier using a double clad PM thulium-doped fiber. We demonstrate >10W of output peak power for 50ns pulses over repetition rates from 50kHz to 2MHz. For 4-μs pulses and a repetition rate of 50kHz, our MOPA delivers 28μJ of pulse energy.
Current progress in infrared LIDAR, atmospheric sensing, and DWDM transmission system experiments highlights the need for large bandwidth, high dynamic range polarization-maintaining (PM) optical amplifiers in the 1900 nm—2100 nm band [1—6]. Amplifiers that can operate efficiently near the high wavelength end of this band at 2090—2100 nm are particularly attractive for many emerging applications. In this paper we present the first simulated and experimental results for a newly developed miniature packaged Ho-doped fiber amplifier that is optimized for operation at 2090—2100 nm and employs high performance single clad PM Hodoped fiber (iXblue IXF-HDF-PM-8-125). Our goal in building a packaged PM Holmium-doped fiber amplifier (HDFA) at 2100 nm is to provide a miniaturized device with output powers of > 200 mW CW, high small signal gain, low noise figure, and large OSNR that can be used in many applications as a versatile wideband preamplifier or power booster amplifier. Our novel miniature HDFA package, shown in the photograph of Figure 1, has dimensions of 97 × 78 × 15 mm3, incorporates full pump control electronics, and communicates via an RS232 interface. The device is fully isolated against external and internal reflections and employs FC/APC connectors for the input and output ports.
We report the design, optical architecture, and performance of a multi-watt tunable polarization-maintaining Tm-doped fiber laser that can be tuned from 1890—2050 nm. The compact OEM laser exhibits peak fiber coupled output powers of > 3.5 W CW and a linewidth of < 0.05 nm. Data as a function of output wavelength are presented for the output spectrum, output power, OSNR, and long term power stability.
2 μm high power and high performance amplifiers are needed for applications such as LIDAR, remote sensing, and WDM transmission systems. In this paper we report the experimental evaluation of the performance of multistage multiwatt optical amplifiers using a high performance PM single clad Tm-doped fiber. Our amplifier exhibits a large dynamic range ( > 25 dB), a saturated output power > 2 W at 1909 nm, an optical bandwidth from 1875 to 2000 nm, a low noise figure (< 6 dB), a large OSNR (> 50 dB), and a PER > 20 dB.
Recent developments in LIDAR, atmospheric sensing, and WDM transmission system experiments highlight the need for large bandwidth, high dynamic range polarization-maintaining (PM) optical amplifiers in the 1.9—2.1 μm band. While some results for all-double-clad PM amplifier designs have been presented, single clad PM amplifiers are particularly attractive in these applications because of their potential for high gain and low noise figures approaching the quantum limit. There is also a strong and growing need for need for compact and rugged amplifiers to boost modest (1 mW CW) semiconductor laser source output powers in a space/satellite environment. In this paper, we report first experimental results for a newly developed single clad PM Thulium-doped fiber with the parameters shown in Table 1 below and an optical signal bandwidth of < 120 nm, and then present performance of a miniature packaged optical amplifier using this new fiber.
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