Topic
Wavelength-division multiplexing
About: Wavelength-division multiplexing is a research topic. Over the lifetime, 25059 publications have been published within this topic receiving 332027 citations. The topic is also known as: WDM.
Papers published on a yearly basis
Papers
More filters
TL;DR: A three-channel WDM system that simultaneously uses avalanche photodiodes and superconducting single-photon detectors is demonstrated and achieved 12 h continuous key generation with a secure key rate of 208 kilobits per second through a 45 km field fiber with 14.5 dB loss.
Abstract: A high-speed quantum key distribution system was developed with the wavelength-division multiplexing (WDM) technique and dedicated key distillation hardware engines. Two interferometers for encoding and decoding are shared over eight wavelengths to reduce the system’s size, cost, and control complexity. The key distillation engines can process a huge amount of data from the WDM channels by using a 1 Mbit block in real time. We demonstrated a three-channel WDM system that simultaneously uses avalanche photodiodes and superconducting single-photon detectors. We achieved 12 h continuous key generation with a secure key rate of 208 kilobits per second through a 45 km field fiber with 14.5 dB loss.
81 citations
TL;DR: In this article, the phase relationship between SRS-induced and XPM-induced crosstalks was investigated, and it was shown that the combined crosstalk level can be as high as 40 dBc after 25 km with two wavelengths and 18 dBm per wavelength of transmitted power.
Abstract: We investigate, theoretically and experimentally, crosstalk between wavelengths in subcarrier-multiplexed (SCM) wavelength-division multiplexed (WDM) optical communication systems. Crosstalk arises mainly from interactions between subcarriers on one wavelength and the optical carrier of another wavelength. In a dispersive fiber, crosstalk can be attributed to stimulated Raman scattering (SRS) and cross-phase modulation (XPM) combined with group velocity dispersion (GVD). We investigate the phase relationship between SRS-induced and XPM-induced crosstalks. Crosstalks induced by SRS and XPM add in the electrical domain and can interfere constructively or destructively. Experimental results show that the combined crosstalk level can be as high as 40 dBc after 25 km of SMF with two wavelengths and 18 dBm per wavelength of transmitted power. We propose two crosstalk countermeasures. The first countermeasure uses parallel fiber transmission. We show theoretically that both SRS-induced and XPM-induced crosstalks can be cancelled to the first order. We present an experimental demonstration of concept which has achieved 15 dB of crosstalk cancellation over 200 MHz. The second countermeasure uses optical carrier suppression. We show, theoretically and experimentally, that by suppressing the optical carrier, we can significantly reduce crosstalk while maintaining the same link budget and carrier-to-noise ratio (CNR) at the receiver, 20 dB of crosstalk reduction over 2 GHz has been demonstrated experimentally.
81 citations
TL;DR: In this paper, a simulated annealing algorithm is adopted to give an automatic pump configuration in laser-diode backward-pumped-distributed fiber Raman amplifiers.
Abstract: A simulated annealing algorithm is adopted to give an automatic pump configuration in laser-diode backward-pumped-distributed fiber Raman amplifiers. The demonstration of the optimization process of wavelengths and powers in an optical-fiber Raman amplifier using four laser-diode pumps is presented. The resulting gain ripple is less than 2.6 dB in respect to the 30 dB average gain in the amplification bandwidth of more than 50 nm (64 signal channels). The algorithm can be practically applied to the desired signal channel number and gain profile.
81 citations
Patent•
08 Apr 2002
TL;DR: In this paper, a bandwidth brokering system and method incorporating methodology for supporting self-healing communication rings is disclosed, which utilizes state-based tokens that are transmitted on a separate communication channel between network nodes to monitor and correct communication failures occurring at a link, interface, and network node level.
Abstract: A bandwidth brokering system and method incorporating methodology for supporting self-healing communication rings is disclosed. The present invention utilizes state-based tokens that are transmitted on a separate communication channel between network nodes to monitor and correct communication failures occurring at a link, interface, and network node level. The invention as taught permits generic brokering of all available network bandwidth in a granular method without the need for fixed designations of “protection” or “working” communication paths. As such, the present invention permits integration of “protection” and “working” communication data paths to permit full utilization of available system bandwidth with graceful recovery in the event of system or link malfunctions. While the present invention is optimally adapted to use in optical communications systems and specifically those incorporating wavelength division multiplexing (WDM), dense wavelength division multiplexing (DWDM), and ultra-dense wavelength division multiplexing, the teachings presented are equally well adapted to situations where other communications mediums are utilized in a multi-carrier, wireless, or spread-spectrum environment, among others.
81 citations
TL;DR: In this paper, the first single-fibre lightwave transmission system with more than 1 Tbit km/s capacity was described, which was achieved by closely spaced wavelength division multiplexing of ten distributed feedback lasers.
Abstract: We describe the first single-fibre lightwave transmission system with more than 1 Tbit km/s capacity. The ultrahigh-capacity transmission over 68.3 km of low-loss single-mode fibre was achieved by closely spaced wavelength division multiplexing of ten distributed feedback lasers. The lasers operated around 1.5 μm wavelength and the multiplexer channel spacing was 1.35 nm. Each laser/channel was modulated at 2 Gbit/s giving a total transmission capacity of 1.366 Tbit km/s.
81 citations