DGD-1000 First Order PMD Source/Emulator

First order PMD source that generates precise differential group delay (DGD) of up to 400 ps with no second order PMD.

Wavelength range options: Single band: C band, L band or O band; Dual band: CL
DGD range options: 0 to 200 ps or 0 to 400 ps
DGD resolution: 0.2 ps
DGD accuracy: ± (0.2 + 2% of DGD) (ps)

Datasheet

Overview

Polarization mode dispersion (PMD) can degrade the quality of high-speed fiber-optic data transmission, and high-speed transceivers must meet stringent standards for PMD tolerance. The DGD-1000 is a first order PMD source that generates precise amounts of differential group delay (DGD) of up to 400 ps, with no second order PMD.

The instrument accurately and repeatably generates both high and low values of DGD, or first-order PMD. Both the DGD and the polarization dependent loss (PDL) are stable over time and over wavelength within the performance band.

The DGD-1000 is intended for generating accurate DGD values over a large range for PMD tolerance testing of coherent detection systems. It is available in different versions to cover different wavelength bands (C, L, O or dual C/L) and DGD ranges (200 ps or 400 ps), and is controlled over USB, GPIB or Ethernet.

Key Features

Large DGD range (up to 400 ps)
Accurate at both low and high DGD values
Output DGD and state of polarization (SOP) stable over time
Output DGD is wavelength insensitive over the specified band
Very low IL and PDL variability over output DGD range
DGD, PDL and IL offset controls
No second order PMD

Specifications

Optical

Wavelength range options	Single band: C band, L band or O band; Dual band: CL
DGD range options	0 to 200 ps or 0 to 400 ps
DGD resolution	0.2 ps
DGD accuracy	± (0.2 + 2% of DGD) (ps) At 23±5°C
DGD repeatability	± (0.2 + 2% of DGD) (ps) At 23±5°C
DGD change rate	Up to 64 ps/s
Insertion loss (IL)	≤3.5 dB Product page lists <3.5 dB; datasheet value shown
PDL	≤0.3 dB Product page lists <0.3 dB; datasheet value shown
Return loss	>50 dB
Optical power handling	>300 mW
Input/output fiber type	SMF-28
Optical connector type	FC/APC, FC/PC, SC/APC, or SC/PC

Interfaces

Communication interfaces	USB, GPIB and Ethernet

General

Operating temperature	5 to 40 °C
Storage temperature	−20 to 60 °C
Power supply	100 – 240 VAC, 50 – 60 Hz
Dimensions	2U, 19” ¾ rack width 14" (L) x 14" (W) x 3.5" (H)

Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.

Applications

Polarization performance testing of coherent receivers
System PMD tolerance testing
First order PMD performance simulation
PMD tolerance testing of coherent detection systems

Options & Accessories

Option	Description
C	Wavelength: C band — Ordering code DGD-1000-XX-XXX-X-XXX, wavelength field
L	Wavelength: L band — Ordering code DGD-1000-XX-XXX-X-XXX, wavelength field
O	Wavelength: O band — Ordering code DGD-1000-XX-XXX-X-XXX, wavelength field
CL	Wavelength: C/L bands — Ordering code DGD-1000-XX-XXX-X-XXX, wavelength field
200	DGD range: 200 ps
400	DGD range: 400 ps
0	Functions: source function only
FC/APC	Connector: FC/APC
FC/PC	Connector: FC/PC
SC/APC	Connector: SC/APC
SC/PC	Connector: SC/PC