Upgrading WDM Networks Using Ultradense WDM Channel Groups
18
Citation
8
Reference
10
Related Paper
Citation Trend
Abstract:
In order to upgrade conventional wavelength-division-multiplexing (WDM) networks, we propose to use ultradense (UD) WDM channel groups. One UD-WDM channel group replaces one WDM channel and traverses the WDM network following the same path as the original WDM channel. We show experimentally that each conventional 100-GHz-spaced WDM channel can be upgraded in this way to have the transmission capacity of 20-40 Gb/s.Keywords:
Channel spacing
Channel spacing
Four-wave mixing
Fiber Bragg Grating
Cite
Citations (23)
An athermal 40-channel dense wavelength-division-multiplexing multi/demultiplexer using a novel combination technology is proposed. It consists of one 1times4 100- to 400-GHz spacing interleaver filter and four sub-arrayed-waveguide gratings (AWGs). The temperature-dependent wavelength shift of the combined device is successfully suppressed to 0.058 nm in the -20degC to 70degC temperature range. Moreover, the combined device's adjacent crosstalk (typically -35 dB) is much better than conventional AWGs (typically -25 dB).
Demultiplexer
Channel spacing
Crosstalk
Optical add-drop multiplexer
Arrayed waveguide grating
Cite
Citations (2)
With an ever increasing demand for bandwidths in lightwave communication networks. DWDM with a channel spacing of ≤0.8 nm plays an important role. This requires DWDM devices with a flat-top transmission spectrum, a high channel isolation and low insertion loss for the EDFA flat gain wavelength range [1]. In this paper, DWDM devices with a 0.4 nm channel spacing using apodized FBGs and bandpass WDM filters (BWDM) in cost-effective structures are demonstrated.
Channel spacing
Demultiplexer
Apodization
Optical add-drop multiplexer
Cite
Citations (0)
The dominant choice of wavelengths in wavelength division multiplexing has been so far 1.3 and 1.55 μm, because these two bands correspond to the low-loss and wideband (electrical) regions of a single-mode fiber in the optical spectrum. Consequently, such interband wavelength division multi/demultiplexers (WDMs) have been developed by using a fused taper coupler technique or an interference filter technique,1-3 and they are widely available now. To increase the number of channels further, however, these two techniques encounter very difficult problems, if not insoluble, in terms of channel spacing in the case of a fused taper WDM or insertion loss in the case of a filter WDM.
Demultiplexer
Channel spacing
Wideband
Optical add-drop multiplexer
Cite
Citations (2)
Channel spacing
Crosstalk
Four-wave mixing
Cite
Citations (14)
This work is focused on how to implement 4- and 8-channel dense wavelength division multiplexing (DWDM) system, with each channel of 10 Gbps over an optical span of 100 km in the presence of four wave mixing (FWM) under the impact of unequal-channel spacing and laser line-width. In this proposed work, we have evaluated electrical power, Q-factor and average eye opening of 4- and 8-channel dense wavelength division multiplexing in the presence of FWM under the impact of equal channel spacing of 0.24 nm and 0.27 nm at 100 kHz, 10 MHz and 100 MHz laser line-widths. The comparison of parameters in the terms of electrical power, Q-factor and average eye opening has been observed at different laser line-widths.
Channel spacing
Four-wave mixing
Line (geometry)
Realization (probability)
Optical power
Cite
Citations (18)
An integrated model of photonic crystal (PC) demultiplexer that can be used to combine dense wavelength-division multiplexing (DWDM) and coarse wavelength-division multiplexing (CWDM) systems is first proposed. By applying the PC demultiplexer, dense channel spacing 0.8 nm and coarse channel spacing 20 nm are obtained at the same time. The transmission can be improved to nearly 90%, and the crosstalk can be decreased to less than −18 dB by enlarging the width of the bus waveguide. The total size of the device is 21×42 μm 2 . Four channels on one side of the demultiplexer can achieve DWDM in the wavelength range between 1575 and 1578 nm, and the other four channels on the other side can achieve CWDM in the wavelength range between 1490 and 1565 nm, respectively. The demonstrated demultiplexer can be applied in the future CWDM and DWDM system, and the architecture costs can be significantly reduced.
Demultiplexer
Channel spacing
Optical add-drop multiplexer
Cite
Citations (3)
The cost effective of coarse wavelength division multiplexing (CWDM) become more interested topic in the platform for metro networks compare to the alternative dense-WDM (DWDM), which is well established in long-haul application. Arrayed waveguide grating (AWG) is a key element for WDM system in optical communication due to ability to multiplex and demultiplex light of different wavelength. In the present work, two conventional AWGs with 4 channel were designed to operate in CWDM, where the conventional AWG usually is designed to operate in WDM or DWDM system. The devices were designed to operate at central wavelength 1.51 /spl mu/m and 1.55 /spl mu/m with 20 nm wavelength spacing between the channels. The maximum insertion loss for both devices is around 4.5 dB. Besides, the crosstalk for AWG with center wavelength 1.51 /spl mu/m and 1.55 /spl mu/m is found to be less than -32.50 dB and -30.52 dB respectively.
Arrayed waveguide grating
Channel spacing
Crosstalk
Optical add-drop multiplexer
Cite
Citations (5)
The authors report high performance dense WDM multiplexers and demultiplexers with a 0.4 nm channel spacing. Special apodised FBGs and low loss bandpass WDM filters are utilised. The demonstrated cost effective eight-channel dense WDM devices have a high channel isolation of > 25 dB and an insertion loss of ~7.5 dB. The WDM devices can be expanded to 32 or 64 channels in the same structures.
Demultiplexer
Channel spacing
Optical add-drop multiplexer
Cite
Citations (10)