Sales of optical components and modules dropped sharply in the first few months of 2017 because of very low demand for these products in China. The situation in China remains uncertain, but the market for optical transceivers managed to return to growth in the second quarter of 2017, as shown in the figure below. Sales […]
Tag: DWDM
What is TIP (Telecom Infra Project)?
The Telecom Infra Project (TIP) is an engineering-focused initiative driven by operators, infrastructure providers, system integrators, and other technology companies that aim to reimagine the traditional approach to building and deploying telecom network infrastructure. Current Projects TIP now shared the fist set of technical projects and the chairs. The projects covering three aspects: Access, Back haul […]
The differences between SDH and SONET
SDH stands for synchronous digital hierarchy. SDH is the synchronous technology used everywhere except the US, Canada and Japan. Development of this international counterpart to SONET began a few years after SONET. The differences between SONET and SDH are based primarily on the different asynchronous bit rates that must be mapped into them. In developing […]
6 reasons why SONET
With the introduction of PCM technology in the 1960s, communications networks were gradually converted to digital technology during the years that followed. To cope with the demand for ever-higher bit rates, a multiplex hierarchy or plesiochronous digital hierarchy (DSn) evolved. The bit rates start with the basic multiplex rate of 1.5 Mb/s with a further […]
7 Reasons Why SDH (Synchronous Digital Hierarchy)?
Communications networks gradually converted to digital technology after PCM was introduced in the 1960s. A multiplex hierarchy known as plesiosynchronous digital hierarchy (PDH) evolved to cope with the demand for everhigher bit rates. The bit rates start with the basic multiplex rate of 2 Mbps with further stages of 8, 34, and 140 Mbps. In […]
The Challenges of Data Transmission toward Tbps Line rate in DWDM System for Long haul Transmission
1. Introduction Since the late 1990, the transport capacities of ultra-long haul and long haul optical fiber communication systems has been significantly increased by the introduction of EDFA (Erbium Dropped Fiber Amplifier), DWDM, DCM (Dispersion Compensation Module), and FEC (Forward Error Correction) technologies. By utilizing these technologies, the universal on/off-keying (OOK) modulation along with direct […]
Wavelength Division Multiplexing (WDM)
WDM Introduction WDM dramatically expands the total capacity of an optical network by enabling a large number of independent wavelength channels to travel within the same network. This core technology allows network capacity to be gradually and cost effectively increased while flexibly allowing multiple generations of transmission technologies to be supported on the same network […]
DWDM Disadvantages and DWDM Advantages
DWDM Advantages and DWDM Disadvantages Breif introduction about DWDM Fiber with great capacity of bandwidth for long haul back bone data transmission. and DWDM, which is short for Dense Wavelength Division Multiplexing. is one of the dominant technology used to utilize the application of fiber cable. It means multiplex a group of wavelengths into and […]