We present, for the first time, a detailed investigation of the impact of second order co-propagating Raman pumping on long-haul 100G WDM DP-QPSK coherent transmission of up to 7082 km using Raman fibre laser based configurations. Signal power and noise distributions along the fibre for each pumping scheme were characterised both numerically and experimentally. Based on these pumping schemes, t...

Conclusions: The feasibility of operating an analogue lightwave system over dispersive fibre using a directly modulated DFB laser has been demonstrated for the first time. The effect of fibre dispersion was to produce carrier suppression and second order sum products. By limiting the modulation depth to the linear region of the laser, a single octave, eight channel, broadcast quality, video tra...

We have proposed and demonstrated a Q-switched Thulium doped fibre laser (TDFL) with a 'Yin-Yang' all-fibre cavity scheme based on a combination of nonlinear optical loop mirror (NOLM) and nonlinear amplified loop mirror (NALM). Unidirectional lasing operation has been achieved without any intracavity isolator. By using a carbon nanotube polymer composite based saturable absorber (SA), we demon...

Background: Dual wavelength laser generation has been of constant interest due to their applications in optical communications and teraheartz generation. A novel configuration for Dual-wavelength laser generation based on the use of a couple of multimode interference (MMI) filters is demonstrated in a ring cavity Erbium-doped fibre laser. Methods: The MMI filters consist of a segment of no-core...

Up-to-date fibre lasers produce multi-kw radiation with an excellent beam quality. Compared to CO2-lasers, fibre lasers have relatively low operational costs and offer a very high flexibility in production due to the beam delivery with process fibres. As a consequence, fibre lasers have attracted more and more attention. On the other hand, their use in industrial applications especially in the ...

introduction: the role of laser in conservative management of oral disease is well established. laser procedures are common in the fields of oral surgery, implant dentistry, endodontic, and periodontic therapy. case: this case series describes the use of diode laser for the excision of oral exophytic lesions. all the patients attended the oral medicine department of shahid beheshti university o...

In this paper the delivery of high power Er:YAG laser pulses through a silica hollow core photonic crystal fibre is demonstrated. The Er:YAG wavelength of 2.94 µm is well beyond the normal transmittance of bulk silica but the unique hollow core guidance allows silica to guide in this regime. We have demonstrated for the first time the ability to deliver high energy pulses through an all-silica ...

BACKGROUND We compared the parameters of retinal nerve fibre layer in patients with advanced glaucoma with the use of different OCT (Optical Coherence Tomograph) devices in relation to analogical measurements performed with GDx VCC (Nerve Fiber Analyzer with Variable Corneal Compensation) scanning laser polarimetry. MATERIAL/METHODS Study subjects had advanced primary open-angle glaucoma, pre...

The development of thulium-doped fibre lasers (TDFL) is motivated by numerous potential applications in spectroscopy, remote sensing, medicine, material processing, and telecommunications. The all-fibre corepumped ring cavity TDFLs exploiting fiberized grating-based filter [1] or Fabry-Pérot etalon [2] as a wavelength selective element were reported. An optical isolator should be inserted into ...