Description
The Micro Interferometer (MINT) is a Delay Line Interferometer (DLI) that performs the interference between an incoming signal and itself delayed by one bit-time. Dedicated to D(Q)PSK demodulation it can be used in many other applications. MINT is tunable to enable a precise matching of the carrier frequency. Two phase tuning options are available: the ultra-fast option (U), which exhibits very low tuning time constant (20µs), and the low voltage option (L), which needs only 3V to reach the tuning range.
The WT-MINT is a Widely Tunable MINT that enables to set the delay of the interferometer to the desired value. This can be done either with a micrometer head (manual option) or with a motorized translation stage (piloted version). In both case U and L option are available to precisely match the carrier frequency. There are three ranges of WT-MINT:
- WT-MINT 100ps: it enables to set an optical delay range of 100ps (corresponding to a Free Spectral Range of 10GHz to infinite, or – for instance – 5GHz to 10GHz). Available with manual or piloted option.
- WT-MINT 300ps: it enables to set an optical delay range of 300ps (corresponding to a Free Spectral Range of 3.3GHz to infinite, or 2.5GHz to 10GHz). Available with manual or piloted option.
- WT-MINT 3000ps: it enables to set an optical delay range of 3000ps (corresponding to a Free Spectral Range of 0.33GHz to infinite). Available with piloted option only.
MINT and WT-MINT products are also available with PM fibers.
Block diagrams
The incoming signal is split in two parts. One is delayed regarding the other and then both are recombined on two outputs where they interfere one with each other. Both outputs are phase shifted by 180° and thus can be plugged to balanced or differential photodiodes that will convert a phase modulation into an amplitude modulation.
The delay between both arms of the interferometer should be equal to the time-bit (Tbit) of the incoming signal. Then the interferometer is characterized by its Free Spectral Range (FSR) which is linked to Tbit by the relation FSR=1/Tbit.
Absolute maximum ratings
Parameter
Symbol
Min
Typ.
Max
Unit
Remarks/Conditions
Maximal optical input power
OpIn
300
mW
Storage temperature range
MINT
STR
-40
80
°C
WT-MINT
-10
40
Humidity
RH
5
85
%
Non condensing
Fiber bend radius
20
mm
Maximum input voltage
U option
Vmax
100
V
L option
4
Operating conditions
Parameter
Symbol
Min
Typ.
Max
Unit
Remarks/Conditions
Operating wavelength
OWR
1520
1570
nm
Operating temperature range
MINT
OTR
0
70
°C
WT-MINT
10
35
MINT specifications
MINT, FSR > 2.5GHz
Parameter
Symbol
Min
Typ.
Max
Unit
Remarks/Conditions
Free Spectral Range1
FSR
2.5
GHz
Any FSR > 2.5GHz can be provided
FSR accuracy1
ΔFSR
1
%FSR
Insertion Losses1
IL
2.0
dB
IL uniformity1
ΔIL
0.5
dB
Polarization Dependant Losses1,2
PDL
0.3
dB
Polarization Dependant Frequency Shift1,2
FSR>10GHz
PDFS
2.0
%FSR
FSR<10GHz
4.0
Extinction Ratio1
ER
18
dB
Polarization Extinction Ratio1,3
PER
20
25
dB
Temperature Dependant Frequency Shift
L
TDFS
10
%FSR
U
50
Tuning range
1.5
FSR
Tuning voltage
L
V
3
V
Voltage needed to reach the tuning range
U
75
90
Tuning time constant
L
τ
1.0
s
To reach 50% of the final state
U
0.02
ms
Power consumption
L
P
0.5
W
U
0.001
Polarization Mode Dispersion
PMD
0.1
ps
Chromatic Dispersion
CD
1
ps/nm
Optical Return Loss
ORL
35
dB
Skew
0.5
1.0
ps
Packaging size4
FSR >= 20GHz
44 x 26 x 9.5
mm3
FSR < 20GHz
or PM fiber any FSR
100 x 55 x 16
Phase tuning connector
0.1 inch PIN header
Fiber Pigtail Type
SM
SMF-28
With 900µm loose tube
PM
PANDA PM
Fiber Pigtail Length
0.9
1.0
1.1
m
1 measured over OTR and OWR for all states of polarization
2 for Single Mode MINT
3 for Polarization Maintaining MINT
4 excluding fiber boot
MINT, FSR < 2.5GHz
Parameter
Symbol
Min
Typ.
Max
Unit
Remarks/Conditions
Free Spectral Range1
FSR
0.4
2.5
GHz
Any FSR between 400MHz and 2.5GHz can be
provided
FSR accuracy1
ΔFSR
5
%FSR
Insertion Losses on short arm1
IL1
9.0
dB
Including 6dB of natural losses due to
beamsplitter
Insertion Losses on long arm1
IL2
9.0
dB
Polarization Extinction Ratio1,3
PER
20
25
dB
Tuning range
1.5
FSR
Tuning voltage
L
V
3
V
Voltage needed to reach the tuning range
U
75
90
Tuning time constant
L
τ
1.0
s
To reach 50% of the final state
U
0.02
ms
Power consumption
L
P
0.5
W
U
0.001
Polarization Mode Dispersion
PMD
0.1
ps
Chromatic Dispersion
CD
1
ps/nm
Optical Return Loss
ORL
35
dB
Skew
0.5
1.0
ps
Packaging size4
130 x 65 x 19.5
mm3
Phase tuning connector
0.1 inch PIN header
Fiber Pigtail Type
SM
SMF-28
With 900µm loose tube
PM
PANDA PM
Fiber Pigtail Length
0.9
1.0
1.1
m
1 measured over OTR and OWR for all states of polarization
2 for Single Mode MINT
3 for Polarization Maintaining MINT
4 excluding fiber boot
MINT statistic data
Here are the statistic data of our MINT delivered between January 2009 and March 2013 (any FSR from 2.5Hz to 100GHz, any phase tuning option).
For PDFS and ER, we do not observe Gaussian repartition because these parameters depend on the FSR (larger is the FSR, better are PDFS and ER).
WT-MINT specifications
The 100ps WT-MINT allows a tunable FSR from 10GHz to infinite.
WT-MINT, 100ps Optical Delay Range
Parameter
Symbol
Min
Typ.
Max
Unit
Remarks/Conditions
Optical Delay Range
ODR
100
ps
Manual WT-MINT ODR sensitivity
8
fs
Motorized WT-MINT
Minimum incremental motion
2
fs
Relative accuracy
75
fs
Unidirectional repeatability
15
fs
Bidirectional repeatability
20
fs
Insertion Losses1
IL
2.5
dB
IL uniformity1
ΔIL
0.5
dB
Polarization Dependant Losses1,2
PDL
0.5
dB
Polarization Dependant Frequency Shift1,2
PDFS
3.0
%FSR
Extinction Ratio1
ER
18
dB
Polarization Extinction Ratio1,3
PER
20
25
dB
Tuning range
1.5
FSR
Tuning voltage
L
V
3
V
Voltage needed to reach the tuning range
U
75
90
Tuning time constant
L
τ
1.0
s
To reach 50% of the final state
U
0.02
ms
Power consumption
L
P
0.5
W
U
0.001
Polarization Mode Dispersion
PMD
0.1
ps
Chromatic Dispersion
CD
1
ps/nm
Optical Return Loss
ORL
35
dB
Skew
0.5
1.0
ps
Packaging size4
216 x 92 x 40
mm3
Phase tuning connector
BNC
Fiber Pigtail Type
SM
SMF-28
With 900µm loose tube
PM
PANDA PM
1 measured over ODR, OTR and OWR for all states of polarization
2 for Single Mode WT-MINT
3 for Polarization Maintaining WT-MINT
4 excluding micrometer head or piloted actuator
The 300ps WT-MINT allows a tunable FSR from 3.3GHz to infinite or 2.5GHz to 10GHz.
WT-MINT, 300ps Optical Delay Range
Parameter
Symbol
Min
Typ.
Max
Unit
Remarks/Conditions
Optical Delay Range
ODR
300
ps
Manual WT-MINT ODR sensitivity
15
fs
Motorized WT-MINT
Minimum incremental motion
3
fs
Relative accuracy
150
fs
Unidirectional repeatability
30
fs
Bidirectional repeatability
40
fs
Insertion Losses1
IL
4.0
dB
IL uniformity1
ΔIL
1.0
dB
Polarization Dependant Losses1,2
PDL
0.8
dB
Polarization Dependant Frequency Shift1,2
PDFS
5.0
%FSR
Extinction Ratio1
ER
15
dB
Polarization Extinction Ratio1,3
PER
20
25
dB
Tuning range
1.5
FSR
Tuning voltage
L
V
3
V
Voltage needed to reach the tuning range
U
75
90
Tuning time constant
L
τ
1.0
s
To reach 50% of the final state
U
0.02
ms
Power consumption
L
P
0.5
W
U
0.001
Polarization Mode Dispersion
PMD
0.1
ps
Chromatic Dispersion
CD
1
ps/nm
Optical Return Loss
ORL
35
dB
Skew
0.5
1.0
ps
Packaging size4
216 x 92 x 40
mm3
Phase tuning connector
BNC
Fiber Pigtail Type
SM
SMF-28
With 900µm loose tube
PM
PANDA PM
1 measured over ODR, OTR and OWR for all states of polarization
2 for Single Mode WT-MINT
3 for Polarization Maintaining WT-MINT
4 excluding micrometer head or piloted actuator
The 3ns WT-MINT allows a tunable FSR from 0.33GHz to infinite. The 12ns WT-MINT allows a tunable FSR from 83MHz to infinite.
WT-MINT, 3ns to 12ns Optical Delay Range
Parameter
Symbol
Min
Typ.
Max
Unit
Remarks/Conditions
Optical Delay Range
ODR
3000
ps
Minimum incremental motion
3ns delay
10
fs
12ns delay
40
Relative accuracy
3ns delay
250
fs
12ns delay
1000
Unidirectional repeatability
3ns delay
30
fs
12ns delay
120
Bidirectional repeatability
3ns delay
150
fs
12ns delay
600
Insertion Losses on short arm1
IL1
9.0
dB
Including 6dB of natural losses due to
beamsplitter
Insertion Losses on long arm1
IL2
9.0
dB
Polarization Extinction Ratio1,2
PER
20
25
dB
Tuning range
1.5
FSR
Tuning voltage
L
V
3
V
Voltage needed to reach the tuning range
U
75
90
Tuning time constant
L
τ
1.0
s
To reach 50% of the final state
U
0.02
ms
Power consumption
L
P
0.5
W
U
0.001
Polarization Mode Dispersion
PMD
0.1
ps
Chromatic Dispersion
CD
1
ps/nm
Optical Return Loss
ORL
35
dB
Skew
0.5
1.0
ps
Packaging size
750 x 400 x 129
Phase tuning connector
BNC
Fiber Pigtail Type
SM
SMF-28
With 900µm loose tube
PM
PANDA PM
1 measured over ODR, OTR and OWR for all states of polarization
2 for Polarization Maintaining WT-MINT
Packages layout
描述 [描述] 一种延迟线干涉仪(DLI),它在输入信号和其本身之间进行一比特时间延迟的干扰。