Optical Clock Recovery Instrument

TCR801 Datasheet

The TCR801 Optical Clock Recovery is a dual band clock recovery instrument centered around 26 and 53 GBd. The advanced architecture of the TCR801 allows the user to adjust Phase Lock Loop (PLL) bandwidth to comply with standards, and is a crucial component in the test and validation of the optical designs when used with other testing and measuring instruments.

Key features

Designed to lock in two ranges:
- 25.6 to 29 GBd PAM2/NRZ or PAM4
- 51.2 to 58 GBd PAM2/NRZ or PAM4
1250 nm to 1650 nm wavelength
Adjustable PLL bandwidths to configure the “Golden PLL” response required for the standard compliance testing
Various locking modes that include intelligent auto relock, quick relock, and lock initiation from the front panel of the instrument
Provides two separate RF clock outputs
Ability to synthesize an adjustable clock output when an optical input signal is not available
2 x 20 LCD is used to view network IP address and current lock status, including the measured symbol rate

Applications

Design/Verification of High-Speed Components and Systems
Signal integrity analysis
Compliance test for industry standards: 25G, 50G, 100G, 200G, 400G IEEE 802.3 standards such as 400GBASE-FR8, 400GBASE-DR4, and similar optical direct detect standards.

User interface

The TCR801 Optical Clock Recovery is operated with a simplified stand-alone user interface, with control from the Windows 10 or Windows Server UI. The communication between the Windows machine and the TCR801 Optical Clock Recovery is based on an IEEE 802.3 Ethernet network, such as 100BASE-T or 1000BASE-T standards. The corresponding Programmatic Interface (PI) commands are used in automation environments to control the instrument functionality.

TCR801 EN US 85W 61709 00 — The user interface connected to a TCR801 Optical Clock Recovery and locked to a 53.125 GBd SSPRQ pattern

Locking modes

Depending on current workflow, the TCR801 includes several locking modes to help streamline device operation. Alongside lock initiation from UI or PI, the TCR801 front panel button can be used to initiate a lock and intelligently locks faster on signals similar to previous inputs. In manufacturing environments where optical switches are commonly used, the auto relock functionality typically locks to the target signal in less than 1 second, providing a stable trigger to sampling oscilloscopes in time critical situations.

The TCR801 power button is multi-function. Press the power button to initiate a quick relock on the previously set symbol rate and hold to power off the instrument.

Compliance testing

The TCR801 Optical Clock Recovery compliance test for industry standards: 25G, 50G, 100G, 200G, 400G IEEE 802.3 standards such as 400GBASE-FR8, 400GBASE-DR4, and similar optical direct detect PAM4 standards. It also supports high speed NRZ standards such as 100 Gb Ethernet (100GBASE-LR4 or similar), which operates at the rate of 25.78125 Gb/s.

Compliant clock recovery

Golden PLL

Standards that use the Golden PLL for the compliance test relay on the TCR801 to recover the clock as per the IEEE 802.3 or similarly required loop bandwidth and roll-off.

The communication standards specify the testing carried out using a recovered clock derived from the data signal. Typically, Phase Lock Loop requirements are defined in terms of –3 dB bandwidth of the recovery loop, the rate of roll-off of the frequency response, and the degree of response peaking allowable.

The TCR801 Optical Clock Recovery instrument has an advanced architecture supporting two ranges of input symbol rates, around 26 GBd and around 53 GBd, with loop bandwidths in the required range for both PAM2/NRZ and PAM4 signals.

The recovered clock is around 13 GHz.

Interoperable and flexible

The TCR801 Optical Clock Recovery is used with any sampling oscilloscope, BERT, or Pattern Checker/Error Detector. For example, the TCR801 can interface with Equivalent Time (Sampling) Oscilloscopes, such as the Tektronix DSA8300 or TSO820 instruments for optical testing at 26 GBd or 53 GBd.

High-sensitivity operation accommodates low-amplitude signals

The TCR801 Optical Clock Recovery has high input sensitivity for applications involving low signals, which enables the user to use a wide variety of external optical splitters to trade off the power and is delivered to the TCR801 versus the acquisition platform (oscilloscope or error detector).

PC requirements

Windows 10 (64-bit) or Windows Server (64-bit)

Specifications

All specifications are guaranteed unless noted otherwise.

Instrument characteristics

Data interfaces: Single mode, FC/PC connector

Symbol rate coverage

Instrument operates over two nominal ranges (typical operation well beyond these)

25.6 to 29 GBd
51.2 to 58 GBd

Wavelength range: 1250 nm to 1650 nm

Data insertion loss

External splitter recommended

50/50% (included)
20/80%
10/90%

Data average optical power (max): 4 dBm at 1310 nm

Input sensitivity

-10 dBm at 1310 nm (typical, OMA) with PRBS13Q or similar

- 8 dBm at 1310 nm (typical, OMA) with PRBS31Q, SSPRQ or similar

Conditions

PAM4 modulated signal with TDECQ < 3.4 dB. Sensitivity at higher TDECQ might be lower depending on signal distortion.
OR PAM2/NRZ modulated signal passing 100GBASE-LR4 specification using pattern such as PRBS31 or other patterns with same or higher edge density.

Counter accuracy: +/- 10 ppm (typical)

Clock outputs

Clock interface: 50 Ω single-ended, AC coupled. 3.5 mm SMA compatible connector

Clock output range

For input data in range 25.6 to 29 GBd: fBd / 2

For input data in range 51.2 to 58 GBd: fBd / 4

Loop bandwidth: User settable 0.2 MHz to 10 MHz

Locking range, typical: ±1000 ppm

Peaking

Response of the instrument is as required by IEEE 802.3bs with appropriate 20 dB/decade roll-off

Jitter, RMS (typical)Jitter measured over all transitions; typical defined by 80^th percentile.

PRBS13Q: < 195 fs with 200 uW OMA at 53.125 GBd, 4 MHz Loop Bandwidth

SSPRQ: < 415 fs with 600 uW OMA at 53.125 GBd, 4 MHz Loop Bandwidth

Output waveform shape: Sinusoidal

Output amplitude: 1 V_pp (typical)

Control

Control interface: IEEE 100BASE-T, 1000BASE-T, RJ45 connector

Device information: Serial number, revision codes are available for using software / PI

Physical

Height: 56 mm (2.20 in.)

Depth: 561 mm (22.09 in.)

Width: 203 mm (7.99 in.)

Weight: 4.5 kg (10 lbs.)

Environmental

Temperature

Operating: 0 to 40°C

Nonoperating: –20 to 60°C

Relative humidity

Operating: 95% at or below 30°C; 5-45% above 30°C to below 40°C

Nonoperating: 95% at or below 30°C; 5-45% above 30°C to below 60°C

Acceleration (5-500 Hz)

Operating: 0.27 g_rms

Nonoperating: 2.28 g_rms

Ordering information

Clock recovery instruments

TCR801: 26 and 53 GBaud Optical Clock Recovery Unit

Standard accessories

Power Supply: External isolated Class 2 power supply. Tektronix P/N 119-8726-00

Cable, Ethernet: 2 m Ethernet cable (CAT6/RJ45). Tektronix P/N 174-7292-00

50/50 splitter: 50%/50% Single Mode FC/PC Splitter. Tektronix P/N 167-4333-00

50 Ω termination: Two 50 Ω termination. Tektronix P/N 015-1022-01

Service options

Opt. G3: Three Year Gold Care Plan. Includes expedited repair of all product failures including ESD and EOS, access to a loaner product during repair or advanced exchange to reduce downtime, priority access to Customer Support among others

Opt. G5: Five Year Gold Care Plan. Includes expedited repair of all product failures including ESD and EOS, access to a loaner product during repair or advanced exchange to reduce downtime, priority access to Customer Support among others

Opt. R3: Standard Warranty Extended to 3 Years. Covers parts, labor and 2-day shipping within country. Guarantees faster repair time than without coverage. All repairs include calibration and updates. Hassle free - a single call starts the process

Opt. R5: Standard Warranty Extended to 5 Years. Covers parts, labor and 2-day shipping within country. Guarantees faster repair time than without coverage. All repairs include calibration and updates. Hassle free - a single call starts the process

Opt. C3: Calibration service 3 years. Includes traceable calibration or functional verification where applicable, for recommended calibrations. Coverage includes the initial calibration plus 2 years calibration coverage

Opt. C5: Calibration service 5 years. Includes traceable calibration or functional verification where applicable, for recommended calibrations. Coverage includes the initial calibration plus 4 years calibration coverage.

Opt. D1: Calibration Data Report

Opt. D3: Calibration Data Report 3 Years (with Option C3)

Opt. D5: Calibration Data Report 5 Years (with Option C5)

Optional accessories

TCR801 SPLT20: 20%/80% Single Mode FC/PC Splitter. Tektronix P/N 167-4332-00

TCR801 SPLT10: 10%/90% Single Mode FC/PC Splitter. Tektronix P/N 119-8667-01