R. Parvizi

FWM-Based Multi-Wavelength Erbium-Doped Fiber Laser Using Bi-EDF

We experimentally demonstrate a simple structure but efficient multi-wavelength erbium-doped fiber laser (EDFL) using a 49 cm Bismuth-based erbium-doped fiber (Bi-EDF) as gain medium. The Bi-EDF provides erbium amplification and FWM effect in the cavity to generate a stable multi-wavelength comb operating in C-band region. We have achieved more than 5 lines with peak power of more than −35 dBm and channel spacing of 0.5 nm by incorporating a broadband fiber Bragg grating and polarization controller in the ring cavity.

Multi-wavelength Brillouin fiber laser using dual-cavity configuration

A simple technique for achieving multi-wavelength tunable multi-wavelength Brillouin fiber laser (BFL) based on dual-pass configuration is demonstrated. The BFL uses a piece of 10 km long non-zero dispersion shifted fiber (NZ-DSF) as a Brillouin gain medium to obtain odd-order Brillouin Stokes waves as an output with the line spacing of 0.16 nm (20 GHz) between each two consecutive waves by employing even-order Brillouin Stokes to improve output performance of the laser. With a BP of 15.3 dBm, at least 15 odd-order Brillouin Stokes and anti-Stokes lines are generated. The laser is room temperature stable, tunable over 50 nm wavelength range and has an optical signal to noise ratio of more than 30 dB at 1560 nm region. This Brillouin fiber laser can operate at any wavelength depending on the Brillouin pump (BP) wavelength used.

Compact Bi-EDF-Based Brillouin Erbium Fiber Laser Operating at the 1560-nm Region

A single-frequency Brillouin erbium fiber laser (BEFL) is demonstrated operating at the 1560-nm region using a simple ring resonator with a very short piece of bismuth-based erbium-doped fiber (Bi-EDF) for the first time. A 49-cm-long Bi-EDF is used to provide both nonlinear gain and linear gain to generate a stimulated Brillouin scattering (SBS) and to amplify the generated SBS, respectively. The BEFL operates at 1559.49 nm with a peak power of -4 dBm and a side-mode suppression ratio of 14 dB when the Brillouin pump (BP) and 1480-nm pump powers are fixed at 6 dBm and 144 mW, respectively. The BP wavelength is also tunable within a wavelength range from 1558.8 to 1560.0 nm.

Semiconductor optical amplifier-based multi-wavelength ring laser utilizing photonic crystal fiber

A multi-wavelength laser source is demonstrated with a semiconductor optical amplifier (SOA) as a gain medium. A multi-wavelength comb with equal spacing is achieved due to Fabry–Pérot modes of the SOA which oscillates in the ring cavity. A 100 m long photonics crystal fiber (PCF) is inserted in the ring cavity to provide a nonlinear gain by four-wave mixing (FWM) so that the output comb spectrum can be greatly broadened and flattened. The stability of the ring laser is also increased due to the efficient FWM phenomenon occurring in the PCF. The SOA-based laser can generate 35 lasing lines with equal spacing of 0.28 nm and extinction ratios of more than 30 dB at room temperature. The number of channels of the multi-wavelength laser can be controlled flexibly by changing the ratio of the coupler used in the ring cavity configuration as well as controlling the polarization state of the oscillating laser.

Multi-wavelength Brillouin fiber laser generation using dual-pass approach

A simple and compact multi-wavelength tunable Brillouin fiber laser (BFL) in conjunction with dual-pass approach is proposed and experimentally compared with the output of a conventional single ring cavity architecture. This BFL source is demonstrated using 10 km long non-zero dispersion shifted fiber (NZ-DSF) as a Brillouin gain medium. By single ring cavity configuration, odd-order Brillouin Stokes lines appear in the backward direction with the line spacing 0.16 nm (∼20 GHz) between each two consecutive waves. However, this single ring cavity in conjunction with dual-pass configuration is able to generate Brillouin Stokes lines with 0.08 nm spacing by providing bi-directional oscillations of Brillouin waves in both forward and backward directions. With a Brillouin pump power of 15.3 dBm, approximately up to 17 Brillouin Stokes lines are generated which is tunable over 40 nm tuning range.

Photonic crystal fiber-based multi-wavelength Brillouin fiber laser with dual-pass amplification configuration

A simple technique for achieving a stable, room temperature and multi-wavelength lasing with narrow linewidth is demonstrated using Brillouin fiber laser (BFL) with a 100-m-long photonic crystal fiber (PCF) in conjunction with a dual-pass configuration. A broadband fiber Bragg grating (FBG) operating in the C-band region is incorporated at the end side of the setup to allow a dual-pass operation. The proposed BFL can operate at any wavelength depending on the Brillouin pump wavelength and the FBGs reflection region used. With a Brillouin pump (BP) of 15.7 dBm, approximately 7 Stokes and 4 anti-Stokes lines are obtained with a line spacing of 0.08 nm.

Investigation on stimulated Brillouin scattering characteristics in a highly doped Bismuth-based Erbium-doped fiber

Stimulated Brillouin scattering (SBS) characteristics in a 49 cm long highly doped Bismuth-based Erbium doped fiber (Bi-EDF) is investigated in the ring and linear cavity configurations. At Brillouin pump (BP) power of 6 dBm, the Brillouin laser peak power of the optimized ring Brillouin Erbium fiber laser (BEFL) is obtained at 23 dB higher than the peak power of the conventional linear cavity at an up shifted wavelength of 0.08 nm. This Bi-EDF ring cavity operates at nearly 1563 nm wavelength region, which is up-shifted by 0.08 nm from the Brillouin pump wavelength with the side mode suppression ratios (SMSR) of 29 and 23 dB in the forward and backward directions, respectively.

Brillouin erbium fiber laser generation in a figure-of-eight configuration with double brillouin frequency spacing

This paper presents an experimental finding of a tunable multiwavelength Brillouin-erbium fiber laser with a double-Brillouin-frequency spacing in a figure-of-eight cofiguration. This double-frequency shifter is formed by incorporating a four-port circulator to isolate and circulate the odd-Stokes signals through a gain medium of a 10 km long nonzero dispersion shifted fiber (NZ-DSF). The ebium gain block amplifies the output even-order Stokes signals formed in a ring cavity. Tip to 15 lasing lines with a wavelength spacing of 0.173 nm have been realized at a 980 nm pump power of 50 mW with a Brillouin pump of 3 dBm. The multiwavelength laser source demonstrates a 10 nm tuning range from 1552 to 1562 nm with the optical signal-to-noise ratio of the desired output channels at around 34.5 dB.

An efficient double-pass Bismuth-based erbium-doped fiber amplifier

An efficient Bismuth-based erbium-doped fiber amplifier (EDFA) is demonstrated using adouble-pass configuration. The amplifier utilizes the double-propagation of the signal provided using an optical circulator at the output end of the erbium-doped fiber (EDF) and has obtained improved gain characteristics as compared to an amplifier of single-pass configuration. This amplifier provides again as high as 30 dB using 215 cm EDF pumped by two 1480 nm pump signals totaling 200 mW in power. In comparison to the single-pass configuration, this amplifier has gain enhancement of more than 9 dB from 1565 nm to 1600 nm wavelength. This proposed amplifier will play an important role in development of a compact EDFA that operates in the L-band region.

Low threshold multiwavelength Brillouin–erbium fiber laser generation in conjunction with a photonic crystal fiber

We propose and demonstrate the most compact low threshold multiwavelength Brillouin?erbium fiber laser (MBEFL) incorporating a 100-m long photonic crystal fiber (PCF) as a Brillouin gain medium. This optimized configuration with a simple ring cavity makes it possible for the first time to achieve more than 22 Brillouin Stokes waves with a line spacing of 0.08?nm (?10?GHz) and more than ?20?dBm power in conjunction with a 100-m long PCF. Using a pre-amplified Brillouin power approach in a ring cavity realizes a low threshold multiwavelength laser with a Brillouin pump power of around 8?dBm at an injected 980?nm pump power of 125?mW. Anti-Stokes lines are also obtained due to four-wave mixing and bidirectional operation.