PolaStay™
The PolaStay™ polarization tracker automatically adjusts the state of polarization (SOP) towards a reference SOP, counteracting continuous input SOP variations as fast as 0.9 ms with no resets. The reference SOP is determined by a feedback signal which can be provided either internally or externally. The internal feedback version (POS-002-I) consists of a fiber squeezer polarization controller, in-line polarization monitor, digital and analog circuits, and proprietary algorithm. The error signal from the polarization monitor is fed back to the polarization controller to maintain a linear SOP at the output. The external feedback version (POS-002-E) replaces the internal polarization monitor with an external analog electrical feedback signal of the user’s choice, such as a voltage proportional to the degree of polarization (DOP) measured by a polarimeter, the bit-error rate (BER) from a BER chip, the RF spectrum of a detected signal, or the optical power after a polarizer. The output fiber can be either single mode fiber or PM fiber with the SOP aligned to its slow axis. This module can be used for PMD compensation, polarization division demultiplexing, elimination of polarization fading in coherent detection and fiber sensor systems, suppression of noise figure in optical amplifiers, and reduction of PDL effects.
Features:
. Reset free operation
. 0.9 ms recovery time
. 47 π/s tracking speed
. Plug and play
Applications:
. PMD compensation
. Polarization demultiplexing
. Elimination of polarization fading
. Coherent detection
Specifications:
Operating Wavelength Range1
1060, 1310 or 1550 ± 50 nm
SOP Recovery Time
< 3 ms (0.9 ms typical)
SOP Rotation Tracking Speed (Reset Free)
47 π/s
SOP Accuracy2
< 0.1 dB
Repeatability2
< 0.1 dB
Insertion Loss
Internal feedback: 0.8 dB typical, 1.2 dB max.
External feedback: < 0.1 dB
Return Loss
> 50 dB
Isolation in Orthogonal Polarization
20 dB
Optical Input Power
-20 dBm to 20 dBm standard for 1310 or 1550nm internal feedback version, -18 to 20 dBm for 1060nm internal feedback version (low power option available)
External Feedback Voltage
0 to 4.6 volts for external feedback version
Optical Power Handling
20 dBm max., higher possible
Optical Power Damage Threshold
300 mW
Operating Temperature
0 to 70 °C
Storage Temperature
-20 to 70 °C
Power Supply
+12 VDC / 0.5A
- 12 VDC / 0.15A
Communications Interface3
RS-232
Dimensions
184 (L) x 98 (W) x 19.1 (H) mm
Notes: Unless otherwise noted, specifications listed above are for the standard configuration with internal feedback option without connectors; specs may be different for instruments with different wavelength or input power ranges.
1. Other wavelengths and control algorithms may be available upon request.
2.The output power fluctuation caused by SOP fluctuation after passing through a polarizer. 3. Requires a special cable (included).
Typical Performance Data:
Figure 1. PolaStay™ polarization tracker function diagram. Either internal or external feedback can be used. Diagram .shows structure for internal feedback.
Figure 2 POS-002-I compensation for a step polarization change
Figure 3. POS-002-I tracking of sinusoidal polarization modulation. rotation at 45π rad/s.
Figure 4. POS-002-I tracking of half-wave plate
Dimensions (in mm):
Ordering Information:
商品属性 [波长] 1060, 1310 or 1550 ± 50 nm