Description
The M3 modal mux/demux is a device that enable to inject/recover 3 different signals coming from 3 different fibers in a single Few Mode Fiber (FMF), where each signal is carried on a spatial mode which is orthogonal to the others those modes 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.
Block diagram
Example of the use of 2 M3 connected with a FMF. Signals go through Beam Splitters (BS) and through Phase Plates (PP) in order to achieve the functionality
Absolute maximum ratings
Parameter
Symbol
Min
Typ.
Max
Unit
Remarks/Conditions
Maximal optical input power
OpIn
+300.0
mW
Storage temperature range
STR
-10.0
50
°C
Humidity
RH
5
85
%
non condensing
Fiber bend radius
20
mm
Operating conditions
Parameter
Symbol
Min
Typ.
Max
Unit
Remarks/Conditions
Operating wavelength
OWR
1530
1570
nm
Operating temperature range
OTR
15
35
°C
Specifications
M3 specifications
IL (dB)
M3-OUT
LP01
LP11A
LP11B
M3-IN
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
IL (dB)
M5-OUT
LP01
LP11A
LP11B
LP21A
LP21B
M5-IN
LP01
15
38
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
Precaution
Termination of FMF fibers can be bare or connectorized. Splicing FMF is quite direct forward and should cause only minor performance degradations. However there is not much experience with FMF connectorization. Some degradation can occur when connecting 2 connectorized FMF, especially for the crosstalk, due to core fiber misalignment etc. This is why performances of M3 are given for an unconnectorized device in this specification sheet.
FMF
The FMF is supplied either by Kylia or by customer. In latter case, an analysis of the fiber will be conducted in order 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:
Package layout
描述 [描述] The M3 modal mux/demux is a device that enable to inject/recover 3 different signals coming from 3 different fibers in a single Few Mode Fiber (FMF)