OM2210 Coherent Receiver Calibration Source

The OM2210 Coherent Receiver Calibration Source includes the capability and software needed for coherent optical receiver calibration. Equipped with two independent free-running lasers and a precision polarization switch, the OM2210 is able to excite the coherent receiver with a known-polarization signal so that the receiver’s linear transfer function can be extracted.

Key capabilities

• Measure Key Performance Parameters for Coherent Receivers such as Quadrature Phase Angle, Path Gains, and Channel Skew
• Obtain Calibration Data over Wavelength for Use in Calibrated Optical Field Measurements
• Calibrate Any Sufficiently Stable Coherent Receiver to Make it Capable of Optical Field Measurements
• Measure Receiver Hybrid Parameters at Any Heterodyne Frequency within the Oscilloscope Bandwidth
• Measure Optical Hybrid Properties in Higher-level Receiver Modules
• The OM2210 can be configured with up to 2 tunable lasers. The OM2012 provides only the tunable laser sources.

Key features

• Full C-band and/or L-band Tunable Continuous Wave Laser
• Integrated Wavelength Locker to Support 50 GHz ITU Wavelength Grid
• Settable Grid Down to 1 GHz
• Off-grid Tuning for Custom Wavelength Applications
• User-adjustable Transmit Power Output (+6 to +15.5 dBm) and Wavelength Adjustment During Operation
• Designed and Verified as RoHS Compliant
• Class 1M Laser Safety Product
• IEC/UL 60950-1 Safety Certified

Applications

• Use with the OM1106/ OM4200 Software for Automated Receiver Testing (see the OM1106 product datasheet for details):
  • Calibration of Coherent Receiver Front-end Characteristics for Use in Calibrated Optical Signal Measurements
  • Integrated Dual Polarization Intradyne Coherent Receiver Frequency-domain Characterization
• Tunable Lasers for Design and Manufacturing Test of 2.5, 10, 40, 100 Gb/s Optical Networking Equipment, including the following:
  • Multi-Service Provisioning Platform (MSSP)
  • Cross Connects
  • Optical Switches
  • Optical Add/Drop Multiplexers
  • Dense Wavelength Division Multiplex (DWDM) Terminals
  • Other Wavelength Division Multiplex (WDM) Metro System Equipment

OM2210 parameter measurements

To measure coherent optical modulation using a minimum of assumptions about the transmitter, it is necessary to measure and correct for any imperfections in the coherent receiver. The OM2210 uses two independent free-running lasers and a precision polarization switch to excite the coherent receiver with a known-polarization signal so that the receiver’s linear transfer function (optical electric field to voltage matrix) can be extracted. The lasers can be tuned across an entire band to obtain measurements vs. channel frequency and heterodyne frequency. The results are plotted and saved in a .mat format file.

OM2210 Coherent Receiver Calibration Source includes the materials and software needed for receiver calibration.

Measurement Typical Uncertainty Note:

• Channel Skew 0.5 ps between any 4 channels
• Crosstalk -40 dB Min measurable between any pair of the 4 channels
• Quadrature phase error 0.2 degrees between quadrature channels
• Optical phase 0.4 degrees between polarization channels
• Path gains 0.1 dB relative gains between channels

The lasers used in the OM2210 and OM2012 products integrate a cooled External-cavity Diode Laser (ECDL). The ECDL uses a thermally tuned etalon filter to achieve single-mode operation at selectable wavelengths. The tunable laser has no moving parts and shares many design elements of standard Distributed Feedback Lasers (DFB).

The tunable laser has low Relative Intensity Noise (RIN), a high Side-mode Suppression Ratio (SMSR), a narrow linewidth, and accurate wavelengths over typical operating conditions. The product complies with the stringent requirements of 300-pin Multisource Agreement (MSA) transponders and discrete line cards.

The following operating specifications were used in the design of the tunable laser:

• ITU-T G.692 
• Telcordia GR-253 
• Telcordia GR-63 CORE NEBS
• Telcordia GR-468 CORE

Additional requirements

All hardware needed for coherent receiver calibration is provided with the OM2210 with the following exceptions:

• Either the OM4000 Series OMA or OM1106 Software is required.
• The computer is not included. See the OM4000 Series datasheet for computer requirements.
• The oscilloscope is not provided. The software is compatible with many oscilloscopes. Check for compatibility at time of order. The minimum requirements include: >10 GS/s per channel, >2.5 GHz bandwidth per channel, 4 channels, LAN connection.
• The DUT is not provided. The DUT must be a dual-polarization intradyne receiver. If the outputs are differential, only 4 may be measured at one time, although TriMode probes are supported that provide automatic switching between P and N.

CAUTION

This device is a Class 1M laser product for use only under the recommended operating conditions and ratings specified in the data sheet. Use of controls or adjustments or performance of procedures other than those specified in the data sheet may result in hazardous radiation exposure.

Invisible laser radiation – Do not view the laser output from this device directly with optical instruments.

This device complies with 21CFR1040.10 except for deviations pursuant to Laser Notice No. 50, dated June 24, 2007.