Unrepeatered DP-QPSK Transmission Over 352.8 km SMF Using Random DFB Fiber Laser Amplification

Rosa, Paweł; Tan, Mingming; Le, Son Thai; Philips, Ian D.; Ania-Castañón, Juan Diego; Sygletos, Stylianos; Harper, Paul

doi:10.1109/lpt.2015.2414712

Cited by 25 publications

(32 citation statements)

References 23 publications

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“…3(b), the electrical spectra of FW-propagated fiber lasers at 1455 nm are shown. We can see that there was no mode structure, which confirms the laser was operating in the random DFB lasing regime [8][9][10][11]. The reason why the RIN of the signal didn't increase was that the minimized reflectivity near the input end led to the reduced efficiency of the Stokes shift (from second order pump to first order fiber laser) in forward-propagated direction.…”

Section: Experimental Setup and Characterizations Of Different Raman mentioning

confidence: 99%

“…The first work on random DFB fiber laser based amplification was demonstrated in [8] where the authors showed a transmission performance improvement using third-order backward pumping. Bidirectional pumping using similar scheme can be also used in unrepeatered transmission in which the RIN-induced penalty on the signal is significantly low [7,9].…”

Section: Introductionmentioning

confidence: 99%

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Transmission performance improvement using random DFB laser based Raman amplification and bidirectional second-order pumping

Tan¹,

Rosa²,

Le³

et al. 2016

Opt. Express

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Abstract:We demonstrate that a distributed Raman amplification scheme based on random distributed feedback (DFB) fiber laser enables bidirectional second-order Raman pumping without increasing relative intensity noise (RIN) of the signal. This extends the reach of 10×116 Gb/s DP-QPSK WDM transmission up to 7915 km, compared with conventional Raman amplification schemes. Moreover, this scheme gives the longest maximum transmission distance among all the Raman amplification schemes presented in this paper, whilst maintaining relatively uniform and symmetric signal power distribution, and is also adjustable in order to be highly compatible with different nonlinearity compensation techniques, including mid-link optical phase conjugation (OPC) and nonlinear Fourier transform (NFT). 2015 Optical Society of America

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Section: Experimental Setup and Characterizations Of Different Raman mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transmission performance improvement using random DFB laser based Raman amplification and bidirectional second-order pumping

Tan¹,

Rosa²,

Le³

et al. 2016

Opt. Express

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“…300km), the generated Raman fibre laser at 1455nm was no longer a Fabry-Perot fibre laser across the whole cavity/transmission fibre. Instead, it was actually two separate random DFB fibre laser located near each side of the span and had no interaction between each other [10]. Fig.…”

Section: Figure 3 (A)schematic Diagram Of Raman Fibre Laser Based Amentioning

confidence: 99%

“…However, forward-propagated (FW) pumping typically introduces relative intensity noise (RIN) to the signal [4]. Due to the capability of RIN mitigation, second order Raman fibre laser (RFL) based amplification has been proven to be an excellent candidate in both long-haul and unrepeatered transmission [5][6][7][8][9][10]. This paper discusses the key technologies and recent advances in RFL based amplification, which mitigate the RIN penalty and extend the maximum reach in long-haul transmission.…”

Section: Introductionmentioning

confidence: 99%

Raman fibre laser based amplification in long-haul/unrepeatered coherent transmission systems

Tan

Rosa

Iqbal

et al. 2017

2017 19th International Conference on Transparent Optical Networks (ICTON)

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The paper reviews the basic principles and recent advances of Raman fibre laser (RFL) based amplification techniques in long-haul/unrepeatered coherent transmission systems. Different aspects of RFL based amplification have been characterised, including signal power distributions and relative intensity noise (RIN). Various RFL based amplifier designs have been evaluated in long-haul coherent transmission systems. The results shows the Fabry-Perot fibre laser based amplifier with two fibre Bragg gratings (FBGs) gives significant Q factor penalty using symmetrical bidirectional pumping, as the RIN of the signal is increased dramatically. However, random distributed feedback fibre laser based amplifier with a single FBG near the output section can mitigate the RIN of the signal, which enables the use of bidirectional second order pumping and therefore gives the best transmission performance up to 7915 km. Furthermore, using random DFB fibre laser based amplifier has been proven to be effective to combat nonlinear impairment. In addition, unrepeatered transmission over >350 km fibre length using RFL based amplification technique has been demonstrated experimentally using DP-QPSK WDM signals.

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“…Low noise distributed Raman amplification is now a well-established method that can overcome the limits set by EDFA and satisfy the bandwidth demand. In both long-haul [3,4] and unrepeatered links [5,6], it offers a broader bandwidth of operation [7] and improved noise performance compared to lumped amplification [2]. In particular, higher-order pumping can minimise the signal power variation (SPV) and reduce the effective attenuation by pushing the gain farther into the span [8,9].…”

mentioning

confidence: 99%

Characterisation of random DFB Raman laser amplifier for WDM transmission

Rosa¹,

Rizzelli²,

Tan³

et al. 2015

Opt. Express

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Abstract:We perform a full numerical characterisation of half-open cavity random DFB Raman fibre laser amplifier schemes for WDM transmission in terms of signal power variation, noise and nonlinear impairments, showcasing the excellent potential of this scheme to provide amplification for DWDM transmission with very low gain variation. IntroductionDemand for capacity in the optical communications network is ever growing, driven by the increasing requirements of internet-based technologies. The exponential increase of data traffic over the past decades has driven the development of multiple technologies capable of delivering higher capacities. However, as we approach the physical capacity limits of optical fiber, the need for higher optical-signal-to-noise (OSNR) requirements [1] becomes evident, and the current design of optical networks based on lumped amplification method (EDFA) will not be able to accommodate the less-noise resistant high level modulation formats required to handle the increased capacity needs in a single mode optical fibre [2]. Low noise distributed Raman amplification is now a well-established method that can overcome the limits set by EDFA and satisfy the bandwidth demand. In both long-haul [3,4] and unrepeatered links [5,6], it offers a broader bandwidth of operation [7] and improved noise performance compared to lumped amplification [2]. In particular, higher-order pumping can minimise the signal power variation (SPV) and reduce the effective attenuation by pushing the gain farther into the span [8,9]. Optimised bidirectional Raman pumping can provide the most uniform gain within the transmission span [10] reducing the ASE noise accumulation that results in high received OSNR. However, the unavailability of low RIN high power pumps makes forward pumping in higher order Raman amplifiers problematic due to the high relative intensity noise (RIN) transfer from the noisy Raman laser pumps that counterbalance the benefits of distributed bidirectional amplification in transmission links [11]. A novel amplification scheme that uses a single fibre Bragg grating (FBG) at the end of the transmission span, forming an open cavity with random distributed feedback (DFB) lasing [12] allows for a form of bi-directional pumping that can significantly reduce the growth of amplified spontaneous emmission (ASE) noise [13] without suffering from elevated RIN transfer from the forward pumps [14], becoming an efficient solution capable of extending the transmission distance for coherent data formats [4]. In this paper we characterise the performance and numerically optimise a random DFB Raman laser amplifier for different span lengths, FBG reflectivities and pumps powers. To the best of our knowledge, up to date this is the only experimentally verified high-order, bi-directional Raman configuration that can extend the reach of the coherent transmission beyond backward pumped Raman and EDFA based transmission systems in standard SMF fibre [4], even relying on fibre laser pumps with high inherent RIN.

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Unrepeatered DP-QPSK Transmission Over 352.8 km SMF Using Random DFB Fiber Laser Amplification

Cited by 25 publications

References 23 publications

Transmission performance improvement using random DFB laser based Raman amplification and bidirectional second-order pumping

Transmission performance improvement using random DFB laser based Raman amplification and bidirectional second-order pumping

Raman fibre laser based amplification in long-haul/unrepeatered coherent transmission systems

Characterisation of random DFB Raman laser amplifier for WDM transmission

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