High speed fiber optic transceivers, including those deploying coherent detection technology for 40Gb/s and 100Gb/s data transmission, must meet stringent PDL tolerance specifications. In addition, the PDL tracking speed and response time of the PDL mitigation algorithm of a coherent detection receiver must be quantified.
The PDLE-101 is specially designed for such PDL-related tests. This PDL source/emulator can generate individual PDL values between 0 dB and 20 dB, with a resolution of 0.1 dB for PDL tolerance testing.
It can also generate variable PDL with user defined range, waveform, and speed for PDL tracking speed and recovery time tests.
The instrument can be controlled via the front panel keypad or by remote control via USB, RS-232, GPIB, or Ethernet interfaces. The residual PMD of the unit is less than 0.1 ps.
Figure 2 : PDL variation functions for PDL tracking speed and recovery time tests : (a) Sine Wave, (b) Square Wave, (c) Triangle Wave and (d) Random-amplitude square wave variation
Figure 1 : PDLE-101 Polarization Dependent Loss Source/Emulator
Key Features
• Large PDL range
• High speed
• High PDL resolution
• Low residual PMD
• PDL scanning
• Random PDL generation
Applications
• PDL tolerance test
• PDL tracking speed test
• PDL recovery time test
• PDL emulation
• Code development for PDL compensation in coherent systems