56Gbaud Clock Recovery Unit，cost-effective and efficient desktop high-speed signal clock recovery unit-Semight Instruments

Product Description

Semight CR6256 is a compact, cost-effective and efficient desktop high-speed signal clock recovery unit, which supports either Non-Return-to-Zero (NRZ) or Pulse Amplitude Modulation 4-level (PAM4) signals clock recovery at 24.33-56.25Gbaud. It is widely used in 400G/800G optical transceiver and Interface test and measurement.

Benefiting from its high sensitivity, low intrinsic jitter, and excellent measurement accuracy, the CR6256 is able to recover clocks from closed-eye signals.

Optical transceiver with built-in DSP/CDR requires the use of a clock recovery unit

（4×56 Gbaud or8×56 Gbaud PAM4）

Key Features and Advantages

Flexible Configuration

Single-Mode and Multi-Mode in one unit; Support both optical and electrical signal clock recovery (optional).

Wide Range

Supports NRZ/PAM4 signal clock extraction at 24.33~56.25 Gbaud.

Excellent Performance
Fast locking speed under auto/semi-auto mode; Ultra Low random jitter.

High Sensitivity
Very conducive to silicon photonic application with ultra-low input optical power.

Wide Application
Complies with IEEE 802.3 Ethernet, PON, Fiber Channel, and OIF standards for 100G/200G/400G/800G and 25G/50G PON optical transceivers testing.

Easy to Use
With either touch lcd screen or flexible remote-control solution, the CR6256 can work with sampling oscilloscopes easily and quickly.

Figure 2 53.125 Gbaud Eye Diagram（TDECQ=1.51 dB）

Technical Specification

Item	Description
Data Rate Input Range	24.33024 ~ 28.9 Gbaud 49.7664 ~ 56.25 Gbaud
Modulation	NRZ/PAM4
Optical Interface	FC/UPC
Electrical Interface	2.92 mm female，50 Ω
Optical Input Power Range	-12 ~ +5 dBm
Optical Sensitivity	-10 dBm @ 53.125 Gbaud PAM4/850 nm -12 dBm @ 53.125 Gbaud PAM4/1310 nm -12 dBm @ 26.5625 Gbaud PAM4
Wavelength Range	800 ~ 1650 nm
Factory Calibrated Wavelength	850/1310 ±10 nm
Recovery Clock Divide Ratio	1/2，1/4，1/8，1/16
Recovered Clock Amplitude	300 mVpp
Recovered Clock Random Jitter	≤230 fs
Clock Output Characteristic Impedance	50 Ω
Loop Bandwidth	4 MHz (typical)

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Technical Specification