| |
|
|
| |
Product
Description - DPSK Demodulator
Optical differential-phase
shift keying (DPSK) provides a desired modulation
format that offers high receiver sensitivity, high tolerance
to major nonlinear effects in high-speed transmissions,
and high tolerance to coherent crosstalk. In DPSK, data
information is carried by the optical phase difference
between adjacent bits. For direct detection of DPSK signal
(by conventional intensity detectors), a DPSK
demodulator is needed to convert the phase-coded
signal into an intensity-coded signal.
Optoplex's Optical DPSK
Demodulator, also known as Delay Line Interferometer
(DLI), converts phase modulation to amplitude modulation
over the entire C+L band in support of data transmission
rates of 2.5, 10 or 40 Gb/s. The DPSK Demodulator is designed
for phase modulated optical communication systems utilized
in commercial, defense and space exploration markets.
The DPSK device plays a key role in improving signal quality
and performance to meet the expanding demand for higher
data rates and more complex transmission formats within
current and next generation systems without major capital
expenditure. Optoplex's DPSK Demodulator is based on a
patented free-space optical design, which is compact,
athermal and polarization-independent. The measured frequency
drift over temperature is only ~0.02 GHz/°C for our
standard passive device. Further, this DPSK Demodulator
exhibits a total polarization-dependent phase shift of
less than 2 degrees over the entire operating temperature
range with a high extinction ratio. Optoplex's DPSK Demodulators
can be configured to be fully tunable, semi-tunable or
purely passive. Dual-Rate DPSK Demodulator is also available.
For DQPSK demodulator, please visit
DQPSK page.
|
|
|
|
| |
Features
and Benefits of DPSK
Demodulator:
- Athermal
design
- C+L
band coverage by a single device
- Low
temperature-dependent frequency shift (TDFS)
- Low
polarization-dependent frequency shift (PDFS)
- Wide
bandwidth
- Low
insertion loss & PDL
- High
power handling
- Passive,
semi-tunable and fully tunable operation
- Suitable
for both RZ and NRZ modulation format
- Telcordia
GR-1221 qualified
|
|
| |
DPSK
Demodulator
Applications:
- 2.5, 10, 20 or 40 Gb/s commercial DPSK
signal reception
- Customized data rate for advanced applications
- Data rate optimization
- Extend transmission distance
|
|
| |
Standard
Specifications
of DPSK
Demodulator :
| Parameter |
Unit
|
Specifications
|
|
Tunable
|
Semi-Tunable
|
Passive
|
| Wavelength
Range (C-Band) |
nm
|
1527
to 1567
|
| Wavelength
Range (L-Band) |
nm
|
1567
to 1607
|
| Free
Spectral Range (FSR)1 |
GHz
|
10.7,
43, 50, 67
|
10.0,
12.5, 40, 50, 66.67
|
| FSR
Error |
M%
|
<
1
|
<
0.015
|
| Insertion
Loss2 (including 2 connectors) |
dB
|
1.7
Typical; 2.2 Maximum
|
| Extinction
Ratio2 |
dB
|
>
18
|
>
18
|
>
20
|
| PMD2 |
ps
|
<
0.1
|
| Return
Loss |
dB
|
>
40
|
| PDL2 |
dB
|
<
0.2
|
| PDFS2 |
deg
|
<
3
|
| TDFS3 |
GHz
|
NA
|
<
1.5
|
| Optical
Path Delay2 (between the 2 receiving ports) |
ps
|
<
1.0
|
| Tuning
Range |
-
|
1.5
x FSR
|
±
3 GHz
|
NA
|
| Tuning
Time Constant4 |
sec
|
~
1.0
|
~
6.0
|
NA
|
| Power
Consumption |
W
|
0.5
Typical, 1.0 Maximum
|
NA
|
| Tuning
Voltage |
V
|
0
to 5
|
NA
|
| Maximum
Input Optical Power |
mW
|
300
|
| Operating
Temperature |
°C
|
0
to 70
|
| Storage
Temperature |
°C
|
-40
to 85
|
| Dimension
(L x W x H)5 |
mm
|
~
39x26x11 for 10~12.5 GHz
~ 26x24x9 for >40 GHz
|
~51x30x18
for 10 or 12.5 GHz
~25x25x11 for 40 GHz
|
| Connector
Type |
-
|
TBD
|
| Fiber
Pigtail Type |
-
|
SMF-28
with 900 µm loose tube
|
| Fiber pigtail
length |
m
|
1.0 ±
0.1
|
Notes:
1. Only typical values are listed. Optoplex can provide
devices with FSR ranging from 2.5 to 160 GHz.
2. Over the stated spectral and operating temperature
ranges and all polarization states.
3. Defined as the time required to reach half-way from
the starting and ending points.
4. Excluding two collimator sleeves extending out from
the two adjacent sides by 21 mm with diameter of 8 mm.
5. Excluding two collimator sleeves extending out from
one shorter side by 17 mm with diameter of 6.3 mm.
|
|
|
Typical
Performance of DPSK Demodulator
|
| |
Product
Request and Ordering Information:
Please
speak to Optoplex Sales persons.
If you request custom-designed DPSK demodulator
product, please provide the following parameters:
- Wavelength
range
- Free
spectral range (FSR)
- Passive,
semi-tunable or fully tunable
- Fiber
length
- Optical
connector type
|
|
|
