VIAVI MAP mHROSA-A2 High Resolution Optical Spectrum Analyzer Module

Single-slot MAP module combining a multi-wavelength meter and a high resolution C-band OSA with 300 MHz resolution bandwidth.

Optical frequency (wavelength) range: 190.7 THz – 196.65 THz (1572.06 – 1524.5 nm)
Absolute uncertainty of frequency (wavelength): ± 370 MHz (±3 pm)
Minimum resolvable separation: 2 GHz (16 pm)
Resolution bandwidth: 300 MHz (2.4 pm)

Datasheet

Overview

The VIAVI MAP High Resolution Optical Spectrum Analyzer (mHROSA-A2) is a single-slot cassette for the Multiple Application Platform (MAP) that combines a multi-wavelength meter and a high resolution optical spectrum analyzer. It is intended for lab and manufacturing test systems, with a focus on coherent transport testing and automated production test.

Measurement principle

Unlike grating-based OSAs, the module uses coherent heterodyne detection: the incoming signal is mixed with a tunable local oscillator laser. Resolution bandwidth is set by the linewidth of the local laser and the electrical bandwidth of the heterodyne receiver rather than by a mechanical slit. A polarization-diverse optical mixer makes the measured amplitude independent of input polarization, and the tunable laser is referenced to a frequency-stabilized artifact to maintain wavelength accuracy across the scan. The module has no moving parts.

With a 300 MHz resolution bandwidth and ±3 pm wavelength uncertainty in the extended C-band, the module resolves densely spaced optical signals as close as 2 GHz and can also serve as a multi-wavelength meter. It reports OSNR, peak power and wavelength, and supports coherent modulation formats and flexible-grid WDM signal analysis, including signals such as 400GZR and 800GZR.

Analysis and control

OSNR and channel detection settings, such as minimum channel spacing, minimum channel elevation and OSNR method, can be adjusted. A splitter compensation value can be set to display the actual fiber power when measuring after a tap coupler. The GUI can be reached remotely over a web connection or through an HDMI monitor, and a version with an integrated touchscreen is also available. For automation, the module accepts SCPI-compliant commands over Ethernet, and the MAP can be ordered with an optional GPIB port.

Platform compatibility

The mHROSA-A2 belongs to the MAP LightDirect family and can be combined with other MAP modules such as power meters, attenuators, switches, sources and signal conditioning modules. According to the datasheet it works only with MAP-300 mainframes. The product web page refers to the earlier MHROSA-A1 and mWAVE-A1 modules and the MAP-200 automation interface; the companion mWAVE-A1 wavemeter is used in MAP-230B and MAP-280 mainframes.

Key Features

Sub-GHz resolution bandwidth
Extended C-band acquisition range
Measures frequency, power level, and OSNR
Continuous and averaging test modes
No moving parts
Multi-wavelength meter and high-resolution OSA in one single-slot cassette
Supports all coherent modulation formats and flexible grid WDM signal analysis
Coherent heterodyne detection with polarization diverse optical mixer
Configurable OSNR and channel detection parameters
Splitter compensation for measurements after a tap coupler
GUI via remote web connection, HDMI monitor or optional integrated touchscreen
SCPI commands over Ethernet, optional GPIB port on the MAP

Specifications

Spectral

Optical frequency (wavelength) range	190.7 THz – 196.65 THz (1572.06 – 1524.5 nm) At 25°C
Absolute uncertainty of frequency (wavelength)	± 370 MHz (±3 pm) Over the entire frequency range; average of five consecutive sweeps
Minimum resolvable separation	2 GHz (16 pm)
Resolution bandwidth	300 MHz (2.4 pm)
Display resolution	0.0001 nm

Power

Input power range	-60 to +10 dBm Power of unmodulated single-frequency laser or peak power of modulated signal in 300 MHz optical bandwidth
Noise floor	-80 dBm
Maximum total input power	+17 dBm Total power for all input signals
Close-in dynamic range	> 40 dB ± 8 pm (±1 GHz); > 50 dB ± 16 pm (±2 GHz)
Spurious-free dynamic range	> 45 dB
Absolute uncertainty of power level	± 0.5 dB Over the entire frequency range; at –20 dBm input power
Power linearity	± 0.74 dB For input power from –10 to –40 dBm
Polarization dependence	± 0.2 dB
Display resolution	± 0.01 dB

Other

Return loss	> 50 dB
Measurement time	1s for 50GHz; 5.6s per 50 GHz ranges >that 50GHz Over 50 GHz sweep range, no averaging
Fiber type	9/125 µm single-mode fiber
Connector type	FC/APC
Calibration period	1 year
Platform compatibility	MAP-300 mainframes only Product web page also mentions the MAP-200 automation interface

Environmental

Operating temperature	10 to 40℃
Storage temperature	-20 to +50℃
Humidity	Maximum 95% RH from +10 to +40℃ noncondensing
Safety compliance	EN61010-1:2001, UL61010-1 and CAN/CSA-C22.2 No.61010-1-04 CE requirement

Physical

Dimensions	4.06 x 13.26 x 37.03 cm
Weight	1.4 kg

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

Applications

DWDM transmission systems test
OSNR, peak power and wavelength reporting
Qualification of optical sources, transponders and linecards
Validation and deployment of coherent flex-grid DWDM modules and systems
Coherent transport testing in manufacturing
Spectrum shaping and filter optimization measurements

Options & Accessories

Option	Description
mHROSA-A2CB10-M100-MFA	Wavemeter and high-resolution optical spectrum analyzer C-band FC/APC
CleanBlastPRO	CleanBlastPRO fiber end-face cleaning system — Optional accessory for removing dirt and debris from connectors in most common applications.
FiberChek	FiberChek probe microscope — Optional one-button handheld fiber inspection probe.
P5000i	P5000i fiber microscope — Optional automated fiber inspection and analysis probe with PASS/FAIL capability for PCs, laptops, mobile devices and VIAVI test solutions.