Q7607 Optical Chirp Test Set For Quick and Easy Measurement of Dynamic Chirp of 50 Gb/s Optical Modulators and Laser Sources ●Supports 50 Gb/s and 10 Gb/s ●Measures wavelengths in C-band and L-band ●Built-in optical amplifier (optional) ●Fast time-domain chirp measurement in 30 sec. or less ●Convenient operation, data collection and display via PC software Q7607 Features Dynamic Chirp Measurement System Wide frequency bandwidth supports 50 Gb/s and 10 Gb/s Chirp Measurement Considerations The Q7607 can be set for an optimum measurement mode of The chirp value is calculated from the difference of a pair either 50 Gb/s or 10 Gb/s. The total frequency measurement of output signals from the Q7607 as measured by a sam- range is 100 Hz to 100 GHz. This allows the Q7607 to also pling oscilloscope. Hence, the time resolution of the chirp measure the Chirp of transmission signals greater than 50 Gb/s. measurement depends on the time resolution of the sam- pling oscilloscope. To make accurate measurements the Wide wavelength measurement range of C- and L-band user should measure the sampling oscilloscope’s optical sig- nal at an appropriate S/N ratio. Also, suitable averaging for Capable of measuring both C-band and L-band. If the output the sampling oscilloscope should be selected to obtain the optical power is insufficient, an optical amplifier can be optimized S/N ratio. installed (optional). Sampling Oscilloscope Considerations Very fast Time-Domain Chirp Measurements in 30 seconds *1) or less The output of the Q7607 is an optical signal. Therefore, an O/E converter with sufficient bandwidth and step Until now, no fast and easy method has existed to measure response is required to display the optical output signal on dynamic chirp. With the Q7607, ADVANTEST makes the sampling oscilloscope. Since individual data bits, not an dynamic chirp measurements a fast and easy process by auto- “EYE”, are displayed on the oscilloscope, a low jitter pat- matically separating the frequency modulation (FM) and tern or frame trigger is also required. intensity modulation (IM) components. Conventional meth- ods using spectral diffraction take 20 minutes or more to make Chirp Measurement Software Considerations (Supplied a chirp measurement. with the system) Fast and Simple Operation The chirp measurement software requires 10 megabytes of free disk space on the personal computer’s hard-drive. A The user can measure chirp using any personal computer ® Pentium class processor, CD ROM reader, a current ver- equipped with GPIB interface. The measurement data file is in ® sion of Windows and a National Instruments GPIB inter- plain text allowing transfer of the data to a spreadsheet, trans- *2) face are required. mission waveform simulator (OptSim) , etc… 1) * : The chirp measuring time depends on the oscilloscope’s trigger setting and other factors. 2) * : OptSim is provided by “ARTIS Software Corporation”. Please contact “ARTIS Software Corporation” for detail. URL http://www.artis-software.com/ Example of Chirp Measurement 2 Q7607-2E Jan. ‘03 System Configuration Excellent chirp and L.E.F reproducibility Products used in system The repetition reproducibility in the measurement is very high Product Type Model (typ. 3%). Optical Chirp Test Set Q7607 (ADVANTEST) Chirp Measurement Software PQ76000402-CD supplied with the system (ADVANTEST) Note: For Windows 98, Windows 2000 or higher Pulse Pattern Generator D3186 (ADVANTEST): Clock Option 10 (150 MHz to 12 GHz) or Clock Option 13 (150 MHz to 12.5 GHz) is necessary. Or 50 Gb/s Pulse Pattern Generator. Frame/pattern sync output is required. Personal Computer Note: OS: Windows 98, Windows 2000 or higher GPIB Board Note: National Instruments, Configured as a controller Sampling Oscilloscope Tektronix: CSA8000, CSA8000B, TDS8000, TDS8000B Agilent Technologies: 83480A, 86110A/B When measurement made ten times Sampling Oscilloscope Plug-in (O/E converter) Tektronix Superimposed data (ten times) (Oscilloscope: Bit rate: Sampling head): 80C85/80C86 Agilent Technologies: 83482A, 83485A/B, A86116A * Optical Amplifier Note: Gain should be fixed Optical Amplifier is unnecessary if the built-in option (OPT7607+10) is used. * Reference Time-resolved chirp measurement of modulator-integrated DFB LD by using a fiber interferometer. OFC '95 Technical Digest Y. Kotaki, H. Soda Windows is registered trademark of Microsoft Corporation in the U.S. Pentium is a registered trademark of Intel Corporation System connection diagram PC with GPIB board from GPIB National Instruments Pulse pattern generator Sampling oscilloscope Chirp Trigger measurement O/E software LD drive current source GPIB Signal Q7607 Optical amplifier* Optical Optical EDFA DUT DFB-LD Optical modulator Optical input Optical output Optical Amplifier is unnecessary if the built-in option (OPT7607+10) is used. * Q7607-2E Jan. ‘03 3 Wide variety display functions L.E.F intensity dependency display The chirp measurement software (supplied with the system) The optical intensity dependency of L.E.F is shown. The displays chirp, optical intensity, and L.E.F (line width software displays L.E.F on the horizontal axis and optical enhancement factor) waveforms. Two of these three mea- intensity on the vertical axis. Notice that the L.E.F distribu- surements can be displayed at the same time. It is also pos- tions for the rising and falling edges of the modulated wave- sible to display two or more superimposed data measure- forms are obvious.This feature is useful to calculate and ments. show the amplitude range and average value of the distrib- uted L.E.F. Time-domain chirp and optical intensity display Q7607 displays time-domain chirp and optical intensity measurements. In addition, the software features horizontal and vertical marker functions. These features enable simple point and delta measurements. Histogram display of L.E.F The software also displays the L.E.F data points in a his- Chirp Modulation waveform togram. This feature allows the user to effectively analyze the L.E.F distribution. Time-domain chirp and L.E.F display Time-domain chirp and L.E.F are displayed. The software package analyzes the L.E.F at the rising or falling edge of the modulated signal. Notice, the average L.E.F value is shown at the lower right of the display. L.E.F Average value of L.E.F Q7607-2E Jan. ‘03 4 Specifications Options Functions Built-in Optical Amplifier: OPT7607+10 Retrofit Optical Amplifier: OPT7607+10A Measurement principle: Using the conversion characteristics between optical frequency and intensity Accessory (supplied with the system) in the built-in optical-fiber-type Mach- Chirp Measurement Zehnder interferometer, the instrument Software: PQ76000402-CD converts the dynamic chirp (optical frequency modulation) into a change in Separately Sold Accessories optical power FM. By controlling the discrimination point of the interferometer, FC connector adapter: A08161 FM is either added to or subtracted from SC connector adapter: A08162 the intensity IM of the optical input signal. ST connector adapter: A08163 Polarization compensation: Automatic polarization compensation by Rack mount kit: EIA, with Front handles A02708 the internal optical-fiber-type polarization JIS, with Front handles A02709 controller EIA, without Front handles A02718 JIS, without Front handles A02719 Built-in optical amplifier with automatic gain 1) * At 23 ±5°C adjustment option 2) * P: optical average power (OPT7607+10): Available as an option, the Q7607 has a 3) * 100 MHz as standard, 1 dB down built-in optical amplifier with automatic 4) gain adjustment. Total output of optical power * The optical output power is approx. 0 dBm, regardless of the optical input power. *1) Performance Specifications Wavelength measurement range: Q7607; 1510 to 1610 nm Q7607+10; 1530 to 1610 nm Optical input power range: -10 to 10 dBm Frequency conversion accuracy: within ±15% FM demodulation *2) coefficient (50 G/10 G):P x 0.021/GHz / P x 0.042/GHz Free Spectral Range (50 G/10 G): 300 GHz ±15 GHz / 150 GHz ±15 GHz Demodulation band *3) width (50 G/10 G) : 100 Hz to 100 GHz / 100 Hz to 50 GHz Deviation of demodulation frequency (50 G/10 G): 135 GHzpp or less / 65 GHzpp or less Insertion loss: Q7607; 13 dB or less *4) Optical output power: Q7607+10; -3 to 0 dBm Input light polarization compensation: Automatically controlled Input/Output Specifications Optical input/output: FC/PC connector (changeable to SC or ST type) GPIB: In accordance with IEEE488-1978 Optical remote interlock: BNC connector (for OPT7607+10/10A) General Specifications Operating environment: Ambient temperature; 0 to +40°C Relative humidity; 85% max. (no condensation) Storage environment: Ambient temperature; -20 to +60°C Relative humidity; 90% max. (no condensation) Power supply: AC100–120 V, AC220–240 V, 50/60 Hz, 100 VA or less Automatic switching between the 100 and 200 V systems Dimensions: Approx. 132 (H) x 424 (W) x 500 (D) mm (Approx. 5.2 (H) x 16.7 (W) x 19.7 (D) in.) Please be sure to read the product manual thoroughly before using the products. Mass: 13 kg (28.7 lbs) or less Specifications may change without notification. 5 Q7607-2E Jan. ‘03