A method for non-intrusively monitoring the polarization dependent loss (PDL) of an installed fiber-optic transmission system is proposed using live dense wave division multiplexing (DWDM)-based traffic as the probing signal. The method extracts the statistical parameters of system PDL from the measured partial PDL data. Field measurements of PDL were performed on long-haul DWDM systems deploye...

Over the recent years, routing and wavelength assignment algorithms (RWA) have been employed to increase the performance of existing optical network architectures. However, these methods are not longer sufficient as the traffic over the Internet increases rapidly and new switching optical network architectures are needed to provide additional bandwidth. This paper reports an investigation into ...

A polarization-independent reflective grating with improved bandwidth is presented based on the mixed metal-dielectric grating. The novel grating is composed of the substrate, the metal slab, two dielectric layers, and the covering layer. The grating parameters are optimized for the special duty cycle of 0.6 at an incident wavelength of 1550 nm used in dense wavelength division multiplexing (DW...

The techniques to implement radio over fiber (RoF) systems using optical subcarrier modulation (SCM) and dense wavelength division multiplexing (DWDM) are reviewed, which include the techniques of SCM, millimeter-wave (mm-wave) generation and reception at base stations, and optical multiplexing/demultiplexing. The impact of system nonlinear distortions and their suppression are also reviewed. I...

We demonstrated a vertically coupled microring resonator (VCMRR) filter as an Add/Drop wavelength filter. However, the accuracy of center wavelength was not sufficiently high for dense wavelength division multiplexing (DWDM) systems. Thus, a UV trimming technique using a SiN (n=2.01 at λ=1.55 μm) ring core was previously developed. Although a wide center wavelength trimming range of −12.1 nm an...

In this study, we examined the effect of phase noise on optical millimeter-wave (mm-wave) signal in a dense wavelength division multiplexing radio-over-fiber (DWDM-RoF) system. A single modulator was used to generate mm-wave DWDM-RoF This paper addresses impact noise, which results from imbalance, signal. To lower signal, imbalance should be controlled. The can controlled and decreased by adjus...

Multiwavelength semiconductor laser source for dense wavelength division multiplexing (DWDM) applications based on a novel dispersive cavity is described. Multiline lasing on the basis of a single-diode laser chip and multi-stripe diode laser is analyzed theoretically and demonstrated experimentally. Simultaneous lasing across 80% of the FWHM of the luminescence bandwidth of the AlGaAs active m...

We investigate the possibility of optical waveguide with multi-levels index of refraction in the core region (more than two-levels) for multi-wavelengths applications analytically and numerically. We show that with slowly varying apodization all of dense wavelength division multiplexing (DWDM) applications with 30-dB sideband suppression and insertion losses of less than 1-dB can be implemented...

It is practical to estimate the pass band width (BW) and blocking band width of a dense wavelength division multiplexing (DWDM) filter as a function of refractive indices, spacers, number of layer pairs, and number of cavities before designing the filter. This can be a practical design guide as to which parameters should be used to gain a desired result. The derivation and resulting formulas fo...