UV-Inscription, Polarization-Dependant Loss Characteristics and Applications of 45$^{\circ}$ Tilted Fiber Gratings

Yan, Zhijun; Mou, Chengbo; Zhou, Kaiming; Chen, Xianfeng; Zhang, Lin

doi:10.1109/jlt.2011.2163196

Cited by 94 publications

(62 citation statements)

References 26 publications

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“…In general, the commercial fiber polarization dependent isolator has 25 dB PER and 30 nm operating bandwidth. For the 45° TFG, the operating bandwidth is beyond 100 nm [18]. The polarizer with high PER and wide operating bandwidth shows the superiority for the passively mode-locked fiber laser based on NPR technology.…”

Section: Introductionmentioning

confidence: 97%

“…D. Panasenko et al had replaced the bulk optical polarizer with a segment of polarization fiber [14]. The 45° TFGs that can discard the s-polarization component from fiber core and leave the p-polarization component propagating in the fiber core with minimum loss have attracted great interests [15][16][17][18]. Based on 45° TFGs, a series of optical fiber devices have been reported, such as PDL compensator, polarization equalizer polarimeter, and filter [15,[19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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All-fiber normal-dispersion single-polarization passively mode-locked laser based on a 45°-tilted fiber grating

Liu¹,

Wang²,

Yan³

et al. 2012

Opt. Express

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An all-fiber normal-dispersion Yb-doped fiber laser with 45°-tilted fiber grating (TFG) is, to the best of our knowledge, experimentally demonstrated for the first time. Stable linearly-chirped pulses with the duration of 4 ps and the bandwidth of 9 nm can be directly generated from the laser cavity. By employing the 45° TFG with the polarization-dependent loss of 33 dB, output pulses with high polarization extinction ratio of 26 dB are implemented in the experiment. Our result shows that the 45° TFG can work effectively as a polarizer, which could be exploited to singlepolarization all-fiber lasers. Pivtsov, "Gamma-shaped long-cavity normal-dispersion mode-locked Er-fiber laser for sub-nanosecond highenergy pulsed generation," Laser Phys. Lett. 9(1), 59-67 (2012). "Measuring ultrashort laser pulses in the time-frequency domain using frequency-resolved optical gating," Rev. ©2012 Optical Society of America

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

All-fiber normal-dispersion single-polarization passively mode-locked laser based on a 45°-tilted fiber grating

Liu¹,

Wang²,

Yan³

et al. 2012

Opt. Express

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“…Actually, p-light shows low IL when the light transmit through the 45TFG. In both measured PDL and IL spectra, the curves looks slightly noisy and rippled, this is mainly due to the application of high resolution tunable laser and refractive index mismatch of air/cladding [32]. Nevertheless, one could notice that the spectra of the 45TFG are rather flat without obvious spectral features.…”

Section: Fabrication and Characterization Of 45tfgmentioning

confidence: 95%

“…Based on the Brewster angle principle, such device shows strong polarization dependent loss (PDL) across a wide range of wavelength. Various applications have been implemented using the 45TFGs such as PDL equalizer [27], in-fiber polarimeter [28], in-fiber polarizer [29], spectrometer [30], interference filter [31] and fiber lasers [32]. We have previously demonstrated that 45TFG can effectively mode lock an Erbium fiber laser in a soliton regime.…”

Section: Introductionmentioning

confidence: 99%

Mode-Locked Erbium-Doped Fiber Lasers Using 45° Tilted Fiber Grating

Wang

Yan

Huang

et al. 2018

IEEE J. Select. Topics Quantum Electron.

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Abstract-We have systematically studied the 45° tilted fiber grating (45TFG) as a functional device for Erbium doped fiber laser (EDFL) mode locking. A number of 45TFGs with different polarization dependent loss (PDL) have been fabricated. Mode locked Erbium doped fiber laser using these devices have been characterized in terms of threshold, pulse duration, signal to noise ratio (SNR), and spectral width. Our results show that a 45TFG with higher PDL could achieve better laser results. By using a 45TFG with 24dB PDL, the mode locked laser has 8.1% conversion efficiency and a threshold of 200mW.

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“…Owing to their unique polarization function, TFGs have been applied as polarimeter, polarization dependent loss equalizer and so on [9][10]. Recently, we have demonstrated in-fiber polarizers with a high polarization extinction ratio (PER) based on 45°-TFGs UV-inscribed in single mode telecom and photosensitive fibers [11,12]. We have also demonstrated that the 45°-TFGs can be UV-inscribed into PM fibers along the fast or slow axis, leading to linear polarization light output.…”

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confidence: 99%

All-fiber polarization interference filters based on 45°-tilted fiber gratings

et al. 2012

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We report all-fiber polarization interference filters, known as Lyot and Lyot-Őhman filters, based on alternative concatenation of UV-inscribed fiber gratings with structure tilted at 45°and polarization maintaining (PM) fiber cavities. Such filters generate comb-like transmission of linear polarization output. The free spectral range (FSR) of a single-stage (Lyot) filter is PM fiber cavity length dependent, as a 20 cm long cavity showed a 26.6 nm FSR while the 40 cm one exhibited a 14. , and laser [6][7] systems. Because of unavailability of in-fiber components, the majority reported Lyot and Lyot-Őhman filters were constructed using bulk polarizers with a polarization maintaining (PM) fiber, inducing not just high insertion loss but also the chunky structure, which is not compatible with all-fiber systems. Tilted fiber gratings (TFGs) were firstly reported by Meltz et al. in 1990 [8]. Owing to their unique polarization function, TFGs have been applied as polarimeter, polarization dependent loss equalizer and so on [9][10]. Recently, we have demonstrated in-fiber polarizers with a high polarization extinction ratio (PER) based on 45°-TFGs UV-inscribed in single mode telecom and photosensitive fibers [11,12]. We have also demonstrated that the 45°-TFGs can be UV-inscribed into PM fibers along the fast or slow axis, leading to linear polarization light output. In this Letter, we propose and demonstrate all-fiber Lyot and Lyot-Őhman filters that are implemented by alternatively concatenating 45°-TFGs and PM fiber cavities with fiber axis at 45°to each other. The bandwidth of the filter is easily controlled by changing the length of PM fiber cavity, while the FSR of transmission bands can be freely tailored by using multistage Lyot filters.The configuration of an all-fiber Lyot filter using two 45°-TFGs is illustrated in Fig. 1(a). In this structure, the two 45°-TFGs created in PM fiber along the fast axis are used as linear polarizers, and a section of PM fiber is used as a BM with its fast axis aligned 45°to that of the two polarizers.The working principle of this all-fiber Lyot filter is as follows: the light that passes the first 45°TFG is linearly polarized and then enters the PM fiber at 45°direction and is resolved into two beams with equal intensity travelling along the fast-and slow-axis of the PM fiber, respectively. Because of the birefringence of the PM fiber, there is a relative phase difference between these two beams; thus when they arrive at the second 45°-TFG, the combined beam will generate interference output of linear polarization state. Figure 1(b) shows a 3-stage all-fiber Lyot-Őhman filter, which can be formed by concatenating four 45°-TFGs spaced by three PM fibers with a length ratio 4∶2∶1 and all aligned at 45°to the fast axis of the PM fibers that are hosting 45°-TFGs. In this 3-stage Lyot-Őhman filter, only the light at the wavelengths in phase (i.e., the phase difference is a multiple of 2π) will be constructive and pass the filter. The final output spectrum thus consists of a serial of...

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UV-Inscription, Polarization-Dependant Loss Characteristics and Applications of 45$^{\circ}$ Tilted Fiber Gratings

Cited by 94 publications

References 26 publications

All-fiber normal-dispersion single-polarization passively mode-locked laser based on a 45°-tilted fiber grating

All-fiber normal-dispersion single-polarization passively mode-locked laser based on a 45°-tilted fiber grating

Mode-Locked Erbium-Doped Fiber Lasers Using 45° Tilted Fiber Grating

All-fiber polarization interference filters based on 45°-tilted fiber gratings

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