Modal Mux/Demuxw w w . k y l i a . c o m
i n f o @ k y l i a . c o m

MX1 – Description
The M3 modal mux/demux is a device that enable to inject/recover 3 different signals coming from 3 different fibers ina single Few Mode Fiber (FMF), where each signal is carried on a spatial mode which is orthogonal to the others thosemodes are called LP01 LP11a and LP11b. This device allows the use of these FMF in a plug and play way.
Kylia also offers a M5 modal mux/demux : the 5 carried modes are LP01, LP11a, LP11b, LP21a and LP21b.

intensity profiles of the various modes carried by the few-mode fiber

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MX1

MX : Modal Mux/Demux2 – Block diagram
Example of the use of 2 M3 connectednnected with a FMF. Signals go through Beam Splitters (BS) and through Phase
Plates (PP) in order to achieve the functionality.

3 – Absolute maximum ratings
Parameter
Maximal optical input power
Storage temperature range
Humidity
Fiber bend radius

SymbolOpIn
STRRHMinTyp.

-10.0520Max+300.05085UnitmW°C%mm

Remarks/Conditions

Max
1570
35Unit
nm°C

Remarks/Conditions

non condensing

4 – Operating conditions
Parameter
Operating wavelength
Operating temperature range

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Symbol
OWR
OTR

Min
1530
15Typ.

MX2

MX : Modal Mux/Demux

5 – Specifications
M3 specifications

M3-IN

IL (dB)

M3-OUT
LP01

LP11A

LP11B

LP01

8.5

32

32

LP11A

32

22

LP11B

32

22

The insertion losses are measured from input connectors of M3-IN to output connector of M3-OUT.
They include the insertions losses of the 50/50 plates:- 1 for the LP01 mode
- 2 for each LP11 modes

M5 specifications

M5-INIL (dB)

M5-OUT
LP01

LP11A

LP11B

LP21A

LP21B

LP01

1538

38

38

38

LP11A

38

28

38

38

LP11B

38

28

38

38

LP21A

38

38

38

23

LP21B

38

38

38

23

These insertion losses are measured from input connectors of M5-IN to output connector of M5-OUT.
They include the insertions losses of the 50/50 plates:- 2 for the LP01 mode
- 3 for each LP11 modes- 2 for each LP21 modes

For devices made with custom FMF, the characteristics of the mux/demux may differ.

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MX3

MX : Modal Mux/Demux

6 – PrecautionTermination of FMF fibers can be bare or connectorized. Splicing FMF is quite direct forward and shouldcause only minor performance degradations. However there is not much experience with FMF
connectorization. Some degradation can occur when connecting 2 connectorized FMF, especially for thecrosstalk, due to core fiber misalignment etc. This is why performances of M3 are given for an
unconnectorized device in this specification sheet.

7 – FMF
The FMF is supplied either by Kylia or by customer. In latter case, an analysis of the fiber will be conducted inorder to check the compatibility of the fiber. This analysis is based on Modes field diameters, cladding
dimensions, and then a spectrally and spatially resolved analysis of the modes is performed. This analysis will
give the number of modes carried by the fiber, their shape, and their crosstalk. See the example below:

8 – Package layout

M3 packaging

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MX4

MX : Modal Mux/Demux

9 – Revision
date
November 14, 2012
December 20, 2012
rdFebruary 3 , 2015

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versionM3 v1.0
M3 v1.1
MX v2.0

ObjectCreation
Characteristics single mux or demux and dual mux anddemux
Added M5 mux/demux

MX5