N4371A Datasheet, PDF (1/4 Pages) Agilent(Hewlett-Packard) – RIN Measurement System

Agilent N4371A
RIN Measurement System
▲ Accurate, high-speed and easy measurements
of RIN frequency characteristics
▲ Reduced uncertainty by using Agilent original
characterization technique (patent pending)
▲ High-speed measurement (5 seconds or less for
20 GHz span, 2000 point, 10 average)
▲ Analysis on multiple traces by various markers
Agilent provides accurate, high-speed
and easy-to-use spectral RIN mea-
surement system by combination of a
sensitive, low-noise optical receiver,
a industry-standard x-series spectrum
analyzer and a digital multi-meter.
RIN (Relative Intensity Noise) is a
parameter representing temporal
intensity fluctuations of a laser signal
and is used as an evaluation index of
the noise characteristic of the laser
devices. RIN is an indispensable item
for indicating the signal quality of both
digital and analog optical transmission
systems.
N4371A Agilent RIN measurement
system provides accurate RIN mea-
surements with a specially developed
characterization technique (patent
pending) for the photoelectric frequency
response of the entire system. Agilent
RIN measurement system also
reduces uncertainties by removing
the interference by thermal noise
and shot noise precisely.
The measurement speed of N4371A RIN
measurement system is very fast by
special control of the spectrum analyzer.
The measurement time is less than
5 seconds with the condition of a 20 GHz
frequency span, 2,000 frequency points
and 10 times average. The high-speed
measurement enables a real-time
observation of RIN frequency charac-
teristics with varying parameters of
the DUT.
The user interface of N4371A RIN
measurement system shown in figure 2
is easily accessible from the spectrum
analyzer display. The user interface
Figure 1. N4371A RIN Measurement System
Figure 2. RIN Measurement User Interface
provides functions of displaying up to
5 traces, placing up to 5 markers and
searching minimum or maximum RIN
values in specific frequency range.