G652D Vs G657A2 Singlemode Optical Fibres Differences and Advantages
Bend it like never before!
G652D and G657A2 specifications refer to the glass and cable construction of optical fibre and are generally the fibres of choice in optical fibre patch leads for singlemode systems.
ITU-T G652D singlemode fibres have been used in all networks for more than 30 years. Being backwards compatible, this makes for easier maintenance/repair (splicing fibres of the same type). The G652D fibre Mode Field Diameter is 10.4µm @1550nm.
G652D fibres provide marginally lower loss transmission, which is better in facilitating long distance communication links (up to and greater than 100km).
However, G652D fibres have limited bend resistance.
G657A2 fibres are used in advanced access cable network installation, where higher bend resistance is required for smaller cable jointing pits and also allows for cable and hardware miniaturisation.
G657A2 fibres are fully compatible with G652D fibres. The G657A2 fibre Mode Field Diameter is 9.8µm@1550nm. Splice losses are slightly higher when splicing the two different fibres together.
G657A2 fibre have greater resistance to bending (macrobend) losses (see figure below), and facilitating low cost deployment techniques.
Figure1: Relevant Bending radii for G652 and G657 fibres.
- Fibre Bending Radii Vs Attenuation Increase at 1550nm.
Fibre Type Bending Radii Attenuation Increase (dB)
G652D 100 turns on 25mm mandrel at 1310/1550nm ≤ 0.03
G652D 100 turns on 30mm mandrel at 1625nm ≤ 0.1
G657A2 10 turns on 15mm mandrel at 1550nm ≤ 0.05
G657A2 10 turns on 15mm mandrel at 1625nm ≤ 0.1
G657A2 1 turn on 10mm mandrel at 1550nm ≤ 0.1
G657A2 1 turn on 10mm mandrel at 1625nm ≤ 0.2
G657A2 1 turn on 7.5mm mandrel at 1550nm ≤ 0.5
G657A2 1 turn on 7.5mm mandrel at 1625nm ≤ 1.0
G652D Marginally lower attenuation and lower splicing losses, when splicing like fibres. Providing longer cable networks.
G657A2 Smaller cable and cords installation radii, providing for low cost installation, miniaturisation and higher density connectorization.
Therefore, G657A2 optical fibre in patch cords, provide an improved bend radius and flexibility, which may allow for better cable management and routing in congested areas. The improved bend radius, may also allow for increased density in high density patching fields. G657A2 optical fibre is becoming very popular in Data Centre and Enterprise network deployments.
Warren & Brown Technologies has a full range of G652D and G657A2 connectivity infrastructure to suit any network, large or small.
To see our full range of products, please visit the product page.
Optical Fibre singlemode patch cords from WBT meets ITU – G657D (optional G657A1 and G567A2) specification, with no water peak and low sensitivity to bends. The single optical fibre cord has the following features: coloured yellow; 9um core dia; 125µm cladding dia; and a 900µm tight buffered core. The core has an aramid yarn (eg Kevlar) strength member, provided under a LSZH sheath. The cord has physical properties of: minimum tensile strength of 100 Newtons; an MBR of 30mm; ability to withstand a small crushing load; and ability to withstand a small impact load. The cord also passes a standard edge bend test.
Every connector assembly supplied by WBT is made using quality parts, in a high quality termination facility, to recognised and approved Australian and International Standards. The quality and inspection procedures employed ensure only high quality, individually inspected and approved pigtails and patchcords are supplied. Therefore Customers can have confidence that the product supplied will perform reliably to a high standard in the Telco network for many years.