N7004A/N7005A Optical-to-Electrical Converter for Infiniium Realtime Oscilloscopes

N7004A/N7005A Optical-to-Electrical Converter for Infiniium Realtime Oscilloscopes 

Fully-integrated Optical Front-end Solutions for Infiniium Real-time Oscilloscope

N7004A characteristics

• DC to 33 GHz typical (-3 dBe, electrical)

• Single-mode and multimode inputs

• 50/125 µm, 750 nm to 1650 nm (covers main wavelengths: 850 nm, 1310 nm, and 1550 nm)

• Designed for reference receiver testing of industry optical standards or characterizing raw response of an optical transmitter

• Optical measurement features built into the Infiniium baseline software version 05.70 or higher

• Compatible with Infiniium UXR, V-Series, 90000 X-Series, Z-Series and discontinued 90000 Q-Series real-time oscilloscopes

N7005A characteristics

• DC to 60 GHz typical (-3 dBe, electrical)

• Single-mode input

• 9/125 µm, 1250 nm to 1600 nm (covers main wavelengths: 1310 nm, and 1550 nm)

• FlexDCA SW supports PAM4 measurement capabilities such as TDECQ for Infiniium UXR oscilloscopes and N7005A

• Optical measurement features built into the Infiniium UXR baseline software version 10.25 or higher

• Compatible with Infiniium UXR oscilloscope with ≥ 40 GHz bandwidth 

The Keysight N7004A and N7005A optical-to-electrical converter is a high-sensitivity DC-coupled photodetector module designed for direct optical-to-electrical conversion of optical telecommunication or data communication signals into an Infiniium real-time oscilloscope. Each N7004A or N7005A adapter contains a measured S-parameter for an optimized correction filter, and this frequency response data is used to flatten the frequency response for a more accurate measurement.

Traditionally, the sampling oscilloscope has been the tool of choice for viewing and measuring optical signals with oscilloscopes. Sampling oscilloscopes provide a myriad of benefits in measuring optical signals with an optimized reference receiver, low noise/jitter, and various measurement features optimized to characterize optical signals. On the other hand, real-time oscilloscopes have been preferred for ample debug/troubleshooting capabilities and the ability to capture intermittent single-shot events with deep memory and fast sample rates. 

N7004A – 33 GHz O/E converter

The N7004A is the first fully-integrated optical-to-electrical converter solution for Infiniium real-time oscilloscopes. A full suite of optical measurement software is built into the Infiniium baseline software v 05.70 and is offered at no additional cost. The N7004A comes in a compact form factor that is plugged directly into the AutoProbe II probe interface of the Infiniium oscilloscope. 

The adapter provides electrical bandwidth ranging from DC to 33 GHz. When used with an Infiniium V-Series, Z-Series or UXR 33 GHz oscilloscope, the N7004A allows users to view optical streams at speeds up to 28 Gbps, making this the ideal solution for characterizing or troubleshooting high-speed optical signals in system level testing. The N7004A with an Infiniium real-time oscilloscope is the ideal solution for users who want to see the unfiltered response of optical transmissions as well.

The input is a 50 µm/125 µm fiber that can be used with a 9 µm single-mode fiber or a 50 µm multimode fiber at wavelengths from 750 to 1650 nm, and also has a FC/PC adaptor. The reference receiver measurement is made with a built-in 4th order Bessel Thomson software filter that allows the waveform to be viewed similarly to what an optical receiver in an actual communication system would display. The 4th order Bessel Thomson filter bandwidth is limited to 2/3 of the Brickwall bandwidth of the oscilloscope. For a 33 GHz oscilloscope with the Bessel Thomson filter on, this yields a 22 GHz Bessel Thomson filter, which covers 28 Gbps x 0.75 = 21 GHz. 

N7005A – 60 GHz O/E converter

The N7005A is a 60 GHz (-3 dB, Brickwall) O/E converter compatible with the Keysight UXR oscilloscope with a 1.85 mm or 1 mm input. The frequency response of a DSP corrected N7005A is either flat to up to 60 GHz Brickwall response or follows a 4th order Bessel Thomson response until it hits the Brickwall at 70 GHz. The N7005A used in conjunction with the 70 GHz Infiniium UXR oscilloscope supports a 4 th order Bessel Thomson response to view optical streams at speeds up to 56 Gbaud PAM4, making this the ideal solution for characterizing or troubleshooting high-speed optical signals in system level testing and debugging. 

Infiniium UXR baseline software v 10.25 or higher covers basic optical measurement features and dark calibration. The FlexRT measurement software installed on Infiniium UXR oscilloscope supports deep analysis of PAM4 signaling measurement capabilities such as TDECQ. 

FlexRT measurement SW controls the UXR-based oscilloscope equipped with N7005A O/E

The N1010100A R&D Package and N1010200A Manufacturing Package can control a UXR-based oscilloscope and the N7005A using a FlexDCA software feature called FlexRT (real-time oscilloscope control). FlexDCA is the same software used to control Keysight’s N1092A/B/C/D Digital Communication Analyzer (DCA-M), which is well-known for performing fast and accurate optical PAM4 measurements, such as TDECQ.