www.agilent.com/comms/lightwave
Spectrum Analysis
Agilent 83453B High-Resolution Spectrometer
•
Characterization of a laser linewidth with 1 MHz (0.008 pm)
resolution
•
Laser modulation analysis, including chirp test
•
Wavelength range 1520nm – 1620 nm
•
Maximum input power +23 dBm for multiple DWDM signals
Accelerating the Design of Laser Sources, Transmitters
and Systems for Access, Metro or Long-Haul Networks
The need to increase capacity and reduce costs in optical networks
is forcing network equipment manufacturers to push performance limits
of DFB laser sources to higher data rates or to look for inexpensive
modulators at 10 Gb/s and 40 Gb/s. Faced with additional demands
to reduce channel spacing and increase transmission rates, designers
must observe and precisely control the spectral behavior of these lasers
and modulators. The challenge is to measure the laser spectrum and to
examine the modulation behavior in sub-picometer measurements.
The Agilent 83453B high-resolution spectrometer (HRS) is the first
calibrated and integrated system that measures the very narrow spectral
characteristics of any laser source or transmitter. The HRS uses the
innovative technology of hetrodyne mixing that allows sub-picometer
resolution measurements to be made directly in the optical domain.
Accurate measurements accelerate laser designs and assure proper
system performance for next-generation networks.
Comparing spectrum measurement between OSA and HRS
Supporting Cost-effective Component Design
DFB laser sources, transceivers and modulators have been pushed
to their physical performance limits at higher data rates to support
network deployment with the most inexpensive modulation technology.
Clear spectral analysis of such optical components during the design
phase helps to improve manufacturability during production. The
measurable resolution of 1 MHz provides more than a hundred times
better resolution than a grating-based optical spectrum analyzer (OSA).
All of the necessary components have been integrated into the 83453B
system to optimize its performance, delivering a solution with extremely
high resolution, dynamic range and wavelength accuracy. Modulated
tunable lasers have cavity modes that generate sidebands close to their
primary oscillation frequency. Grating based OSA cannot detect these
sidebands. The 83453B characterizes spectral aspects of the laser source
and transmitter, such as
•
Linewidth
•
Laser spectral symmetry
•
Modulation spectrum including chirp
•
Relaxation oscillation of unmodulated signal
•
Close-in spurious sidebands
•
Spontaneous Brillouin Scattering (SBS)
Modulation analysis in 10 Gb/s and 40 Gb/s
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