After comparing with the flat-top AWG demux at the 1st link below and the Gaussian AWG demux at the last link, we conclude that this multiplexer is flat-top wide-band type.

With ten 8-fiber ribbon pigtails without connectors from EVEN-Ports and ODD-Ports, with one LC/PC fiber connector at common port. This multiplexer is composed of one 40-even-channel 100GHz-spaced AWM MUX, one 40-odd-channel 100GHz-spaced AWM MUX, and one 100GHz-to-50GHz Interleaver.  

General description for 50 GHz, Wideband (Flat Top) Arrayed Waveguide Gratings (AWG) : (Note: actual AWG is 100GHZ-spacing but it is for 50GHz application with help of Interleaver.)

JDSU 50 GHz, Wideband Arrayed Waveguide Gratings (AWGs) provide a pricec, ompetitive, small-form-factor alternative to standard thin film based dense wavelength division multiplexing (DWDM).

JDSU AWGs are a product of advanced PLC fabrication capabilities, and are offered in both mux and demux configurations. The low cost and high performance make them the ideal solution for Metro and Long Haul DWDM applications.

JDSU AWGs can incorporate micro-controller-based internal temperature control (ITC) circuitry to allow stable alignment with the ITU grid. The optional ITC eliminates the need for external temperature control, and does not impact package dimensions.

Key Features
• Low insertion loss
• Low ripple and superior loss uniformity
• Wide channel bandwidth
• Low polarization dependent loss
• Low chromatic dispersion
• High adjacent channel isolation
• Low power consumption
• Compact size
• Integrated temperature controller (optional)

Applications
• Metro and long haul mux/demux
• OADM network nodes
• Original equipment manufacturer (OEM) applications

Compliance
• Telcordia GR-1221 qualified