Abstract
Unrepeatered 42.7 Gb/s per channel RZ-DPSK transmission over standard SMF-28 fibre with novel URFL based amplification using fibre Bragg gratings is investigated. OSNR and gain performance are studied experimentally and through simulations. Error free transmission for 16 channels across the full C-band with direct detection was experimentally demonstrated for 280 km span length, as well as 6-channel transmission at 340 km and single-channel transmission up to 360 km (75 dB) without employing ROPA or specialty fibres.
Highlights
Stimulated Raman scattering (SRS) is a non-linear process that can provide an optical gain downshifted in frequency and may be used in optical amplification [1]
We investigate OSNR, on-off gain and RZ-DPSK transmission performance in unrepeatered spans up to 360 km using cavity Ultra-long Raman fibre laser (URFL)-based amplification [4]
Continuous wave distributed feedback (CW-DFB) laser diodes (LDs) are multiplexed using a passive athermal arrayed wave-guide grating (AWG) multiplexer to form 16 even channels spread across C-band
Summary
Stimulated Raman scattering (SRS) is a non-linear process that can provide an optical gain downshifted in frequency and may be used in optical amplification [1]. Ultra-long Raman fibre laser (URFL) amplification [4,5,6], relying on a scheme that uses fibre Bragg grating (FBG) to form an ultra-long laser cavity in the transmission fibre, allows to achieve second-cascade pumping of the signal with a single pump wavelength, reducing signal power excursion [6]. This can be used to realise a quasi-lossless span, approximating the optimal case for transmission performance [7] and offers an excellent balance between nonlinear and noise impairments. We investigate OSNR, on-off gain and RZ-DPSK transmission performance in unrepeatered spans up to 360 km using cavity URFL-based amplification [4]
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