Wave division multiplexer arrangement for small cell networks

A method of retrofitting a remote unit of a Distributed Antenna System to an existing passive optical network including end subscribers coupled to a central office via at least a fiber distribution hub and a drop terminal, the method comprising:

• providing a distribution cable including a plurality of distribution fibers, each distribution fiber having a first end plugged into a termination field at the fiber distribution hub and a second end coupled to a first output port of the drop terminal, at least some of the distribution fibers being coupled to the central office via a first feeder cable;
• optically coupling at the termination field a first end of a first of the distribution fibers to a second feeder cable that carries optical signals from a base station so that the optical signals from the base station are carried to the first output port of the drop terminal while another output port of the drop terminal remains connected to one of the end subscribers;
• and
• optically coupling the remote unit to the first output port of the drop terminal so that the remote unit receives the optical signals carried to the first output port by the second feeder cable;
• wherein optically coupling the first end of the first distribution fiber to the second feeder cable comprises:
• plugging one end of the second feeder cable into a port at a first side of the termination field;
• uncoupling the first end of the first distribution fiber from a splitter pigtail at the termination field;
• and
• plugging the first end of the first distribution fiber into a port at a second side of the termination field, the port at the second side connecting to the port at the first side.

A passive optical network comprising:

• a first signal source providing first optical signals;
• a second signal source providing second optical signals;
• a fiber distribution hub including an optical power splitter and a termination field, the optical power splitter being configured to split the first optical signals carried by a first feeder cable from the first signal source to a plurality of splitter pigtails that are plugged into the termination field, the termination field also receiving a connectorized end of a second feeder cable that carries the second optical signals from the second signal source;
• a drop terminal coupled to the fiber distribution hub by a distribution cable that carries the first optical signals and the second optical signals, the drop terminal having a first port receiving the first optical signals and a second port receiving the second optical signals;
• a remote unit coupled to the second port of the drop terminal, the remote unit including an antenna for broadcasting the second optical signals received at the remote unit;
• and
• a cable arrangement having a first end and a plurality of second ends, the first end being plugged into the second port at the drop terminal, the second ends being plugged into ports of the remote unit, thereby coupling the remote unit to the second port of the drop terminal, the cable arrangement including a wave division multiplexer that multiplexes and demultiplexes the second optical signals received at the first and second ends of the cable arrangement.

A passive optical network comprising:

• a first signal source providing first optical signals;
• a second signal source providing second optical signals;
• a fiber distribution hub including an optical power splitter and a termination field, the optical power splitter being configured to split the first optical signals carried by a first feeder cable from the first signal source to a plurality of splitter pigtails that are plugged into the termination field, the termination field also receiving a connectorized end of a second feeder cable that carries the second optical signals from the second signal source;
• a drop terminal coupled to the fiber distribution hub by a distribution cable that carries the first optical signals and the second optical signals, the drop terminal having a first port receiving the first optical signals and a second port receiving the second optical signals;
• a remote unit coupled to the second port of the drop terminal, the remote unit including an antenna for broadcasting the second optical signals received at the remote unit;
• and
• a cable arrangement having a first end and a plurality of second ends, the first end being plugged into the second port at the drop terminal, the second ends being plugged into ports of the remote unit, thereby coupling the remote unit to the second port of the drop terminal, wherein the cable arrangement includes:
• a first optical fiber that defines the first end;
• a plurality of second optical fibers that define the plurality of second ends;
• a wave division multiplexer coupled to the first optical fiber and second optical fibers, the wave division multiplexer being configured to multiplex and demultiplex optical signals carried between the first optical fiber and the second optical fibers based on wavelengths of the optical signals;
• and
• a sealed enclosure surrounding at least the wave division multiplexer to protect against a surrounding environment.