We demonstrate a cost-effective bidirectional WDM self-healing ring network using wavelengthinterleaved bidirectional add/drop amplifier modules. The measured restoration time was less than 10 ms. Recently, bidirectional WDM self-healing ring (SHR) networks based on bidirectional transmission have been proposed [1]-[3]. In these networks, each node should be implemented by using a bidirectional...

We investigate reduction of mode partition noise of a spectrally sliced Fabry-Perot laser diode (FP-LD) for application to seeded DWDM systems. The proposed scheme for the noise reduction incorporates a fiber-based Mach-Zehnder interferometer (MZI) and a reflective semiconductor optical amplifier (RSOA). The MZI enables to reduce a relative intensity noise (RIN) more than 3 dB with better noise...

We report the design, growth, and characterization of an AlGaInP-based VECSEL, designed to be optically-pumped with inexpensive high power blue InGaN diode laser, for emission around 689 nm. Up 140 mW output is achieved in a circularly-symmetric single transverse (TEM 00 ) longitudinal mode, tunable from 683 693 With intensity stabilization pump frequency-stabilization VECSEL resonator referenc...

Abstract Cascaded random Raman fiber lasers (CRRFLs) have been used as a new platform for designing high power and wavelength-agile laser sources. Recently, CRRFL pumped by ytterbium-doped (YRFL) has shown both output low relative intensity noise (RIN). Here, using wavelength- bandwidth-tunable point reflector in YRFL, we experimentally investigate the impacts of YRFL on spectral RIN properties...

In this paper we propose the use of optimized bi-directional distributed Raman amplification to enhance the operating range of Brillouin optical time-domain analysis (BOTDA) sensors. In particular by combining high-power fiber-Raman lasers and polarization-multiplexed Fabry-Pérot lasers operating at 1450 nm with low relative-intensity-noise (RIN), we demonstrate distributed sensing (using first...

We propose and experimentally demonstrate a new method to extend the range of Brillouin optical time domain analysis (BOTDA) systems. It exploits the virtual transparency created by second-order Raman pumping in optical fibers. The idea is theoretically analyzed and experimentally demonstrated in a 50 km fiber. By working close to transparency, we also show that the measurement length of the BO...

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...

SUMMARY Amplification characteristics of the signal and the noise in the semiconductor optical amplifier (SOA), without facet mirrors for the intensity modulated light, are theoretically analyzed and experimentally confirmed. We have found that the amplification factor of the temporarily varying intensity component is smaller than that of the continuous wave (CW) component, but increases up to ...

Counter-propagating all-normal dispersion (CANDi) fiber laser is an emerging high-energy single-cavity dual-comb source. Its relative timing jitter (RTJ), a critical parameter for precision and spectral resolution, has not been comprehensively investigated. In this paper, we enhance the state-of-the-art CANDi pulse energy from 1 nJ to 8 nJ. We then introduce novel reference-free RTJ characteriz...

This paper presents modeling and simulation on the characteristics of semiconductor laser modulated within a strong optical feedback (OFB-)induced photon-photon resonance over a passband of millimeter (mm) frequencies. Continuous wave (CW) operation of the laser under strong OFB is required to achieve the photon-photon resonance in the mm-wave band. The simulated time-domain characteristics of ...