Luna PSG-002/PSG-002-D High-Speed Polarization State Generator Module
Compact high-speed polarization state generator module that switches between six distinct polarization states in a typical 45 µs.
- Wavelength range
- 1480 - 1620 nm
- Operation wavelength (C band)
- 1480 / 1550 / 1620 nm
- SOPs generated
- LCP, RCP, Linear ±22.5°, Linear ±67.5°
- SOP repeatability
- ±0.1° on Poincaré sphere
Overview
The Luna PSG-002/PSG-002-D is a high-speed polarization state generator (PSG) module that generates any of six distinct states of polarization (SOP) on the Poincaré sphere: left circular (LCP), right circular (RCP), and linear states at ±22.5° and ±67.5°. Switching between two consecutive states takes less than 50 µs, with a repeatability better than 0.1°.
Design and control
The module uses a series of four electrically controlled, self-latching polarization switches combined with free-space optics. The self-latching technique reduces power consumption and heat generation, giving zero static power dissipation. The PSG is controlled with a 4-bit TTL signal from a microcontroller or a computer; the PSG-002-D version includes a driver board.
An internal polarizer sits at the input side of the frame. With a PM input fiber, the slow axis is aligned to the polarizer transmission axis; unpolarized or misaligned input light results in higher loss.
Calibration
The output SOPs have a predictable wavelength and temperature dependence. Each module is supplied with a set of calibration parameters derived from measurements at all logic states over wavelength and temperature, and an internal Pt1000 temperature sensor allows the actual output SOPs to be calculated under operating conditions.
The compact package is intended for OEM integration into systems that need precise generation of these six polarization states or precise 90° polarization rotation, such as swept-wavelength component measurement systems.
Key Features
- Switches between 6 polarization states: LCP, RCP, Linear ±22.5°, Linear ±67.5°
- Typical switching time 45 µs
- SOP repeatability 0.1°
- Self-latching
- Zero static power dissipation
- 4-bit control
- Compact package with minimal heat generation
- Calibration parameters supplied with each module
- Internal Pt1000 temperature sensor
Specifications
| Wavelength range | 1480 - 1620 nm |
|---|---|
|
Operation wavelength (C band)
PSG-002-15-PM-1-FC/APC-D
|
1480 / 1550 / 1620 nm
Min / typical / max
|
| SOPs generated | LCP, RCP, Linear ±22.5°, Linear ±67.5° |
| SOP repeatability | ±0.1° on Poincaré sphere |
| SOP repeatability (on Poincaré sphere) | ±0.1 deg |
| SOP relative angle accuracy |
+/- 10 deg
Deviation from 90° of angle between output SOPs on Poincaré sphere; over all wavelengths and temperatures in the operational ranges
|
| SOP accuracy to target |
±5 deg
On Poincaré sphere at center wavelength and 23°C
|
| SOP switching time | 45 µs (with 10 V bias) |
| SOP switching time at bias voltage 10V |
40 / 45 / 50 µs
Min / typical / max; time from drive pulse leading edge to completion of SOP transition
|
| Insertion loss | 1 dB (max) |
|
Insertion loss (C band)
PSG-002-15-PM-1-FC/APC-D
|
1.0 dB
Max; with input polarization aligned to polarizer transmission axis; values referenced without connectors
|
|
Insertion loss (O band)
PSG-002-13-PM-1-FC/APC-D
|
1.2 dB
Max; with input polarization aligned to polarizer transmission axis; values referenced without connectors
|
| State dependent loss |
0.1 dB
Max
|
| Wavelength dependent loss |
0.3 dB
Max
|
| Return loss | -55 dB |
|
Rotation angle wavelength dependence (1550nm)
PSG-002-15-PM-1-FC/APC-D
|
-0.068 deg/nm
Tested at room temperature
|
|
Rotation angle wavelength dependence (1310nm)
PSG-002-13-PM-1-FC/APC-D
|
-0.091 deg/nm
Tested at room temperature
|
|
Rotation angle temperature dependence (1550nm)
PSG-002-15-PM-1-FC/APC-D
|
-0.084 deg/°C |
|
Rotation angle temperature dependence (1310nm)
PSG-002-13-PM-1-FC/APC-D
|
-0.11 deg/°C |
| Optical power handling | 300 mW |
| Input fiber | PM |
| Output fiber | SM |
| Optical input power |
300 mW
Max
|
|---|---|
| Operating voltage (DC) | 12 ± 1.0 V |
| Quiescent current | 5 mA |
| Control |
4-bit TTL signal
From a microcontroller or a computer
|
|---|---|
| Optical head drive circuit power supply |
+12V >1000mA
J1 pins 1 and 2
|
| Control circuit power supply |
+5.5V
J1 pin 39
|
| SPI clock frequency |
10 MHz
Maximum
|
| Operating temperature | 0 to 50 °C |
|---|---|
| Storage temperature | -40 to 85 °C |
| Operational temperature elevation (worst case) |
10 °C
All 4 bits switched simultaneously and continuously; 50μs pulse width and interval, 10V bias, room temperature
|
| Operational temperature elevation (typical operation) |
3 °C
Cycling sequentially through the 6 polarization states
|
| Temperature sensor | RTD Pt1000 |
| Temperature sensor TCR |
3850 ppm/°C
0 °C, 100 °C
|
Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.
Applications
- Mueller matrix-based polarization analysis
- Polarization OTDR
- Performance monitoring
- Swept-frequency component measurement systems
- Polarization rotation
- Quantum communications
- Optical device test and characterization
- Manufacturing test of fiber optic assemblies
- Photonic control for OEMs
Included
- Calibration parameters for the individual PSG module
Options & Accessories
| Option | Description |
|---|---|
| PSG-002-15-PM-1-FC/APC-D | Polarization state generator optical head with driver board, 1550nm — Polarization state generator optical head with driver board, 1550nm, PM input, SM output, 1 m pigtails (typical), FC/APC connectors |
| PSG-002-13-PM-1-FC/APC-D | Polarization state generator optical head with driver board, 1310nm — Polarization state generator optical head with driver board, 1310nm, PM input, SM output, 1 m pigtails (typical), FC/APC connectors |
