Fast Spectrum Analyzer

The Southern Photonics OSA150 Fast Spectrum Analyzer is a low-cost, high-speed instrument that yields highresolution spectral measurements. The OSA150 exhibits a 10dB improvement in the Optical Rejection Ratio (ORR) parameter when compared to conventional Fabry-Perot filter-based OSAs. This improvement in ORR makes the OSA150 an ideal candidate for real-time measurement of closely-spaced DWDM channels in your laboratory or manufacturing facilities.

Measurement Application: Optical power spectrum of 10GHz CS-RZ signal. The OSA150 Fast Spectrum Analyzer (resolution 2GHz) clearly resolves the suppressed carrier mode, unlike the conventional GratingbasedOSA(resolution ~6GHz).

• Bandpass Resolution : 2GHz (16pm)

• Wavelength Repeatability : 0.3GHz (2.4pm)

• Sensitivity : -40dBm

• Dynamic Range : 45dB

• Optical Rejection Ratio (@100GHz) : 40dB

• Polarisation Sensitivity : < 0.3dB

• Wavelength Range : 1500-1580nm

• Sweep Rate (4096 spectral points) : > 20Hz

Pulse Analyser

Southern Photonics offers pulse analyzers optimized for a wide range of high speed optical communications systems. The analyzers take advantage of the SHG-FROG technique to completely recover the spectral and temporal information of the pulse. All this is made possible by complete optical phase recovery. Conventional detectors only give you half the story. For example, a 40Gb/s pulse stream remains unchanged on a oscilloscope display as the modulator bias voltage is adjusted, but the SP Pulse Analyzer shows the change in frequency chirp, allowing complete optimization.

With the SP Pulse Analyzer, the pulse shape and phase are measured, allowing the bias and modulation depth to be optimized, and any chirp characterized.

• Temporal Range (FWHM of pulses) : 300fs-10ps

• Temporal Resolution : 15fs

• Spectral Range : 10nm tunable over C/L Band

• Spectral Resolution : 0.05nm

Real Time Pulse Analyser Electronic Gate

Southern Photonics offers these new pulse analyzers based on the linear electro-absorption gating technique developed at Bell Labs. The analyzers completely recover the spectral and temporal information of C-band pulse several times per second, giving real-time feedback on component and system optimization. All this is made possible by complete optical phase recovery. Conventional detectors only give you half the story. For example, a 40Gb/s pulse stream remains unchanged on a oscilloscope display as the modulator bias voltage is adjusted, but the EG150 shows the change in frequency chirp in real-time, allowing complete optimization.

With the EG150, however, the pulse shape and phase are measured, allowing the bias and modulation depth to be optimized, and any chirp characterized. The graph to the right shows a typical recovery of a 10Gb/s pulse train (generated from the output of a Mach-Zehnder modulator, where pulse amplitude is shown in blue and phase shown in green. As can be seen there is a quadratic phase profile across each pulse and a large modulator-induced phase change at the null points.