The Cisco Prisma II line of optical network transmission products is an advanced system designed to help optimize network architecture and increase reliability, scalability, and cost-effectiveness. The 1310 nm high-density transmitters (HDTx) are designed for use in the standard Prisma II or the Prisma II XD chassis (Figure 1) containing standard power supplies and fan trays. The ability to mix high-density transmitter modules with other Prisma II modules in the same chassis greatly enhances the flexibility of the platform. Up to 26 transmitters can operate in a standard 6-rack-unit (6RU) Prisma II chassis, effectively doubling the density for 1310 nm transmitters in that chassis. Up to 16 HDTx modules fit in the Prisma II XD chassis for even higher density. The transmitters have a 1.2 GHz passband to permit the inclusion of high-order modulation types consistent with DOCSIS 3.1 advances. Microprocessor control allows ease of installation and flexibility of application.