Spring 2018 Optical Connections Magazine


The ever-growing demand for more bandwidth, along with the proliferation of video applications such as IPTV and on-demand video streaming, has pressured network providers to push the envelope on delivering higher- speed services. Communication service providers (CSPs), which include telecom and cable services, have relied on optical networks with a variety of wavelength division multiplexing (WDM) technologies to satisfy this customer demand. In both metro networks using CWDMs and long-haul networks using DWDM, it’s critical to verify the wavelength/channel of the optical signal. Providers must also confirm proper power levels in order to minimize bit errors and other faults. For DWDM networks with small channel spacing, it is imperative to find impairments such as cross talk and noise. Deviser Instruments’ new AE8500 is an optical spectrum analyser (OSA) for testing optical transmission characteristics. Built with manufacturing testing specifications with a The task of a polariser is simple: Removal of light waves whose electrical fields are not shown in a specified direction, by absorption or by reflection. However, as simplistic as the function is, it is hugely important for a number of applications, from telecoms to medical and laboratory technology, and a quality polariser is of paramount importance. The colorPol® polariser, from CODIXX, uses the dichroism of silver nano particles to mostly absorb the unwanted light waves. The particles are embedded in protective glass, making them resistant to most chemicals and UV-radiation, and operable at temperatures between -50 °C Harting’s new PushPull SFP XS fibre- optic connector is designed to address the biggest challenge to the use of optical connectors in the industry: their susceptibility to dirt and damage to the contact surfaces forming the interface Harting push connector challenges

with the transceiver which converts the optical signal into an electrical signal. Contamination in this area can result in poor or useless signals, but the SFP XS connectors do not suer from this problem, says the manufacturer. They can be easily and quickly connected to a transceiver pre-assembled on site without having to open the optical link. The optical contacts are protected, even in dirty operating environments, to guarantee a clean signal. Another key feature of the PushPull SFP XS connector is its sophisticated locking mechanism. Despite the compact design, the and +400 °C, while being only 0.2 – 0.3 mm thin. Transmittance can be as high as 98% with antireflection coating and contrast up to 100,000:1 (50db). Available wavelength ranges are: UV range (340-420nm), VIS, NIR and MIR (440-5 000nm) Bespoke manufacturing means that user do not need to make their applications to match the polariser, but can have the polariser designed to match the application, whether this is size, shape, wavelength range, contrast, lamination, mounted or structured with segments of dierent polarisation. All polarisers follow the international

connector is compatible with various transceiver lengths. It also gives clear tactile and acoustic feedback to the user to indicate a secure connection. As a result, it provides a safe and trouble-free transmission solution for fibre-optic communication in harsh environments. The PushPull SFP XS is suited to use in industrial fibre optic systems involving data transmission rates of more than 10 Gbit/s or distances of well over 100 metres. Typical applications include telecommunications or camera-based surveillance over large areas in the process industry. regulations of REACH, RoHS and PFOS and are DIN-ISO 9001:2008 certified. The company provide samples of standard polarisers, which can be order in sets of four or six, at 10x10mm.

CODIXX provides the smart choice

iXblue Photonics recently announced the launch of optical reference transmitters for -SR4 multimode and -ER4 -LR4 monomode LAN-WDM & C-WDM applications. The ModBox-PAM4 transmitter oers optical modulated output power signals of at least 5dBm at 850nm, 1310 nm or 1550 nm, generates PAM-4 data streams up to 28 Gbaud and NRZ up to 28 Gb/s, and produces clean eye diagrams with high SNR and fast rise/fall times. It also provides flexibility for adjusting the extinction ratio for vertical eye closure. New NRZ and VNA ModBoxes, and a highly linear, wide bandwidth ModBox-PAM4- 28Gbaud are also now available. iXblue launches ModeBox-PAM-4

Deviser tackles bandwidth demand D

small footprint to meet the needs of testing optical networks, the AE8500 is perfect for verifying both the long-haul and metro optical networks. The OSA covers wavelengths of 1250nm to 1650nm, validating power levels and detecting impairments for both CWDM and DWDM systems. The portable unit’s OSNR measurement is essential to validate signal quality as impairments could come from sources such as optical amplifiers. For DWDM systems using erbium doped fibre amplifiers, it is vital to ensure proper power distribution amongst all channels. These tests can be accomplished accurately and quickly with AE8500’s intuitive user interface and fast scans, which performs all of this verification with a single unit, reducing CAPEX.



ISSUE 12 | Q1 2018

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