Optical Modulation Analyzer Tektronix OM4225

The OM4245 Optical Modulation Analyzer (OMA) is a 45 GHz 1550 nm (C- and L- band) fiber-optic test system for visualization and measurement of complex modulated signals, offering a complete solution to testing both coherent and direct-detected transmission systems. The OM4245 consists of a polarization- and phase-diverse receiver and analysis software enabling simultaneous measurement of modulation formats important to advanced fiber communications, including polarization-multiplexed (PM) formats such as QPSK, 8QAM, 16QAM, PAM4, and many others. The OMA software performs all calibration and processing functions to enable real-time burst-mode constellation diagram display, eye-diagram display, Poincaré sphere, and bit-error detection.

Optical modulation analyzer

Maximum detectable baud rate (assuming "raised-cosine" pulse shape, where Bandwidth Required = Baud Rate * (1+Alpha)/2, using an Alpha of 0.1)

OM4245:

80 GBaud with Tektronix DPS77004SX, using 70 GHz inputs

60 GBaud with Tektronix DPS77004SX, using 33 GHz inputs

OM4225:

45 GBaud with Tektronix DPO73304SX, using 33 GHz inputs

Sample Rate: 200 GS/s with Tektronix DPS77004SX
100 GS/s with Tektronix DPO73304SX

EVM noise floor: 1.8%

O/E gain imbalance between I and Q: 0.1 dB

Available modulation formats

OOK, 3-state OOK, (PM) BPSK, (PM) QPSK, (PM) 8, 16, 32, 64-QAM, (PM) Offset QPSK, (PM) 8-PSK, 2ASK2PSK, and PAM4

Any PRBS or user-supplied pattern

Contact factory for new modulation formats

Control: Built-in Ethernet interface

X, Y I/Q Connectors: 2.4 mm, 50 Ω, output only

OM4200 series coherent receiver

Optical input

C-band: 1530 to 1567.5 nm

C- and L-band: 1530 to 1600 nm (Optional)

Maximum input power: Signal input: +10 dBm
Reference input: +16 dBm

Electrical bandwidth: OM4245: 45 GHz
OM4225: 25 GHz

Optical phase angle of IQ mixer after correction: 90° ±1°

Skew after correction: ±1 ps

External local oscillator input

Optical input wavelength range: C-band: 1530 to 1567.5 nm
L-band: 1570 to 1600 nm (Optional)

Suggested external local oscillator input power range: +7 dBm to +16 dBm

Maximum input peak power (damage level): +18 dBm

Instantaneous linewidth

Local oscillator

Wavelength range: C-band: 1527.6 to 1567.5 nm
C- and L- band: 1567.5 to 1609.6 nm (optional)

Output power: >14.5 dBm

Minimum wavelength step: 10 GHz

Minimum frequency step: 100 MHz

Absolute wavelength accuracy: 10 pm

Linewidth (short term): 100 kHz

Sidemode suppression ratio: 55 dB

High-resolution spectrometer

Maximum frequency span: LO frequency ± oscilloscope bandwidth (instantaneous)
1530 to 1600 nm (using Option MCS and Option CL)

LO Wavelength Range

C-band: 1530 to 1567.5 nm

C- and L-band: 1530 to 1600 nm

Number of FFT points: 1 million

Minimum RBW: 1/maximum oscilloscope time window

Frequency accuracy: 10 pm

Key features

Unparalleled flexibility

Optical modulation analyzer architecture is compatible with both real-time and equivalent-time oscilloscopes ¹
Complete coherent signal analysis system for polarization-multiplexed QPSK, offset QPSK, QAM, differential BPSK/QPSK, and other advanced modulation formats
Displays constellation diagrams, phase eye diagrams, Q-factor, Q-plot, spectral plots, Poincaré Sphere, signal vs. time, laser phase characteristics, BER, with additional plots and analyses available through the MATLAB interface
Measures polarization mode dispersion (PMD) of arbitrary order with most polarization multiplexed signals

Precise optical receiver

Precise coherent receiver hardware provides minimal variation over temperature and time for a high degree of accuracy and high-stability, polarization-diverse, optical field detection
Highly linear photo detection allows operation at high local oscillator and signal power levels to eliminate electrical amplification
An integrated pair of ECDL tunable lasers for use as a local oscillator and another for self-test. Both lasers have industry-best linewidth and tuning range for any wavelength within the band
Optical modulation analyzer software tolerates >5 MHz instantaneous signal laser linewidth – compatible with standard network tunable sources such as DBR and DFB lasers
No laser phase or frequency locking required
Smart polarization separation follows signal polarization

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