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Light Source Evaluation for MMF Test


Encircled Flux Standard for Light Source and Multimode Fiber(MMF) Characterization
01/11/2012

MMF AND MODES

……

fundamental mode

higher order

modes

? Each mode in fiber represents a spatial distribution of energy or power that can exist and propagate in fiber ? Standard single mode fiber (SMF) can only accommodate the fundamental mode ? MMF can not only propagate the fundamental mode but also higher order modes because of its large core size ? Whether a higher order mode can propagate in MMF depends on how that mode is launched into it

CONVENTIONAL LAUNCH CONDITIONS INTO MMF

Launch and propagation of modes in a graded-index MMF

? Different launch conditions are present in practice, dependent on wavelength, lightsource and MMF types ? When characterizing MMF such as IL measurement, overfilled launch condition overestimates while underfilled lauch condition underestimates the result. Measurement variations from different lightsources can be +/-50%

(OTDR ) conventional launch conditions for MMF

ENCIRCLED FLUX (EF)
? In order to solve the problem of ‘Different testers yield different results’, IEC 61280-4-1 Ed2.0 proposed Encircled Flux templates in June of 2009 to characterize lightsources and thus launch condition into MMF, then this proposal was adopted by TIA and documented in TIA-526-14A. ? Encircled Flux (EF) is the percentage of total power within a given fiber core radius when light is launched by a transmitter into a multimode fiber ? EF template (shown in the next slides) is defined by the upper and lower bound of the normalized power at core radius of 5um, 10um, 15um, 20um, 22um, respectively
confined power within specific fiber core radius

ENCIRCLED FLUX: POWER VS. RADIUS

? Four EF-templates for two wavelengths (850/1310nm) and two types of MMF (50/125um) ? EF template (shown in next slide) is plotted according to the upper and lower bound of normalized power at different core radius

ENCIRCLED FLUX TEMPLATE: POWER VS. RADIUS
underfilled condition

overfilled condition

? Above figures shows one of four EF templates specified by IEC 61280-4-1 for 850nm /50um MMF; EF-compliance lightsource reduces loss measurement variation to +/- 10% ? $260 for electrical copy of IEC 61280-4-1 Ed2.0 http://webstore.iec.ch/webstore/webstore.nsf/Artnum_PK/43082

EQUIPMENT AND COMPONENT RELATED TO EF
? Encircled Flux Meter
?

Equipment used to determine if output from lightsource or launch condition into fiber under test complies with EF-standard Passive component between the non EFcompliance lightsource and fiber under test to filter out or convert the modes from lightsource so the lauch condition into fiber meets EF-standard

? Mode Controller
?

ENCIRCLED FLUX METER

Principle: near field of the modes out of the lightsource and fiber jumper is imaged through an imaging system onto CCD camera where power is detected and analyzed

Encircled Flux Meter by Arden Photonics in UK

MMF MEASUREMENT SETUP
Fiber Under Test EF-compliance LightSource Power Meter

Option #1: Measurement using EF-comlpiance lightsource

Option #2: Measurement using non EF-compliance lightsource plus Mode Controller

MODE CONTROLLER BY ARDEN PHOTONICS

Main features ? Conforms to IEC 61280-4-1 ? Works at 850 and 1300 nm
OEM mode controller standard mode controller

? Independent of Lightsource type

Note: Arden Photonics may be the OEM manufacturer of JDSU

MODE CONTROLLER BY ARDEN PHOTONICS

MODE CONTROLLER BY FLUKE NETWORKS

Mode Controller

MODE CONTROLLER BY CORNING

Need to work with Corning OTS_600 Sources described as below

encircled flux launch conditioner

MORE WORK
? More literature (patent, whitepapers, etc.) search on mode controller ? Need more info about EF meter (spec., quotation, etc.) ? Comment or Suggestions?


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