Switchable multiwavelength erbium-doped fiber laser with cascaded fiber grating cavities

Mao, Qinghe; Lit, John W. Y.

doi:10.1109/68.998701

Cited by 183 publications

(62 citation statements)

References 11 publications

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“…The experimental setup [9] is shown schematically in Figure 1. Two separate ports of an optical circulator were joined together to form a feedback loop, which functioned as a broadband reflector.…”

Section: Methodsmentioning

confidence: 99%

“…However, tuning and switching the lasing lines still present great challenges. Recently we proposed and demonstrated a multiwavelength erbium-doped fiber laser with coupled linear cavities formed by cascaded fiber Bragg gratings (FBGs) [9]. For this kind of coupled cavity laser, when any one potential lasing wavelength is emitted, the round-trip gain is clamped at the round-trip loss of the corresponding cavity for that lasing wavelength.…”

Section: Introductionmentioning

confidence: 99%

“…Significant progress has been made in improving the schemes and performance of the multiwavelength lasers based on erbium-doped fibers (EDFs) during the past few years [1][2][3][4][5][6][7][8][9]. However, tuning and switching the lasing lines still present great challenges.…”

Section: Introductionmentioning

confidence: 99%

“…From this figure we can see clearly that the laser may be switched to two single-wavelength operation regions and to one dual-wavelength operation region by adjusting the input pump power alone. This happens because, as discussed in [9], when the EDF lengths and the cavity losses are fixed at the optimum values, the gain clamping effect and the competition effect depend only on the pump conditions. To verify such a wavelength switching function of the laser and to investigate the transient response, we drove the pump LD with a DC bias of 110 mA and superimposed on it a square-wave current with a frequency of 10 Hz and a peak-to-peak current of Ϯ40 mA.…”

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confidence: 96%

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Transient response of wavelength‐switchable Erbium‐doped fiber lasers with linear coupled cavities

Mao

Lit

2002

Micro & Optical Tech Letters

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TRANSIENT RESPONSE OF WAVELENGTH-SWITCHABLE ERBIUM-DOPED FIBER LASERS WITH LINEAR COUPLED CAVITIES, the crossgain saturations cause the lasing wavelengths to suppress each other, giving rise to the wavelength competition effects. When the cavity losses and EDF lengths are suitably chosen, the strengths of the gain clamping effects and the wavelength competition effects depend only on the pump conditions. Thus, the laser may be made to lase an individual potential line by suitably adjusting the pump input alone; this means the laser can operate in multiwavelength switching mode. In this letter, we report on the measurement of the transient characteristics of such a fiber laser with coupled linear cavities, which was designed to switch between two potential lasing wavelengths. A delayed switching phenomenon was observed in our experiments. In addition, during the switching operations the two wavelengths experienced initial power excursions and relaxation oscillations before steady states were re-established. In the worst case the delayed response was about 1 ms and the relaxation oscillations could be damped within 3.5 ms. This indicates that the wavelength switching speed could be higher than 100 Hz. EXPERIMENTSThe experimental setup [9] is shown schematically in Figure 1. Two separate ports of an optical circulator were joined together to form a feedback loop, which functioned as a broadband reflector. This broadband reflector and the FBG 1,2 formed overlapping Fabry-Perot (FP) cavities for lasing wavelengths 1 , 2 , respectively. A variable optical attenuator (VOA) was inserted into the feedback loop, thus the reflectivity of the optical circulator reflector could be finely adjusted by changing the loss of the VOA, which could help vary the cavity loss so as to optimize the shape of the gain spectrum of the cavities [7]. The EDFs had an absorption of 5.2 dB/m at 1531 nm and were pumped with a 1480 nm LD through a WDM coupler. Port 1 from a 3-dB optical fiber coupler (OC1) in the feedback loop and port 2 beyond FBG2 were used for the laser outputs. The laser output was measured with an optical spectrum analyzer. A function generator was used to supply the modulation currents to the pump LD to investigate the transient responses of the wavelength switching operations. Another 3-dB optical fiber coupler (OC2) was placed in the output of the laser and two tunable narrow band-pass filters were used to select the two different lasing lines, 1 and 2 . The transient responses of the lasing lines were then measured with two 2-GHz low-noise photodetectors and a 1.5-GHz sampling oscilloscope. RESULTS AND DISCUSSIONSThe two FBGs (FBG1 and 2) used to produce the lasing lines ( 1 and 2 ) had central wavelengths of 1552.76 and 1545.64 nm, FWHMs of 0.24 nm and 0.24 nm, and reflectivities of 85.4% and 86.8%, respectively. When the lengths of the EDF1 and 2 were respectively about 4.5 and 6.2 m, by varying the loss of the VOA, the laser was adjusted to give the multiwavelength output characteristics as shown in Figure 2. From th...

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 96%

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Transient response of wavelength‐switchable Erbium‐doped fiber lasers with linear coupled cavities

Mao

Lit

2002

Micro & Optical Tech Letters

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“…Therefore, in order to obtain the information of the measurand, we need to design practical interrogation for detecting the wavelength shift of FBG. Various interrogation schemes have been developed [3][4][5][6][7][8][9]. Some examples include the configurations based on Fabry-Perot filters [3], wavelength division multiplexer [4], Mach-Zehnder interferometers [5], matched gratings [6], fiber lasers [7,8], and Sagnac loop using chirped gratings [9].…”

Section: Introductionmentioning

confidence: 99%

Influences of photodarkening in highly doping ytterbium‐doped fiber on performance of fiber laser

Mao¹,

Zhu²,

Liu³

et al. 2006

Micro & Optical Tech Letters

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sized ground-planes/laminates nor the connector. The gain was measured across the band and increased from 6.3 to 7.3 dBi. These results are consistent with the antenna presented in Ref. [2] and are slightly lower than the predicted gains of 6.8 to 8.7 dBi; however, the impact of the small ground-plane used and the associated increase in cross-polarization levels and backward directed radiation evident in Figure 3 can easily account for this discrepancy. CONCLUSIONSA technique that can potentially reduce the cost of an MMIC compatible printed antenna by reducing the amount of high dielectric constant material necessary to realize an efficient antenna has been presented. It was found that a thin layer of low cost, moderate dielectric constant laminate between the MMIC layer, and the first patch of a stacked configuration can still produce an efficient, broadband radiator. INFLUENCES OF PHOTODARKENING IN HIGHLY DOPING YTTERBIUM-DOPED FIBER ON PERFORMANCE OF FIBER LASER

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A novel method to realize multi-wavelength with phase-shifted FBG inscribed in PMF

Zhao¹,

Xu²,

Li³

et al. 2005

Laser Phys. Lett.

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A novel grating is proposed to produce multi-wavelength output with inscribing phase-shifted fiber Bragg grating (FBG) in polarization-maintaining fiber (PMF). The reflective spectrum of grating is analyzed by a transfer matrix method. The effects of grating parameters on property of the phase-shifted FBG in PMF are discussed. We find that optimistic phase-shifted FBG in PMF with high reflective peaks, narrow bandwidths and multi-wavelength is possible if the grating parameters are properly selected.

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Switchable multiwavelength erbium-doped fiber laser with cascaded fiber grating cavities

Cited by 183 publications

References 11 publications

Transient response of wavelength‐switchable Erbium‐doped fiber lasers with linear coupled cavities

Transient response of wavelength‐switchable Erbium‐doped fiber lasers with linear coupled cavities

Influences of photodarkening in highly doping ytterbium‐doped fiber on performance of fiber laser

A novel method to realize multi-wavelength with phase-shifted FBG inscribed in PMF

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