DWDM-FM

DWDM (95.5 FM), branded as Pinas FM 95.5, is a radio station, airing an all-OPM format in Metro Manila. It is owned by Eagle Broadcasting Corporation, and is the official radio station of the Organisasyon ng mga Pilipinong Mang-aawit (OPM). The station's studio and transmitter are located at EBC Bldg., No. 25 Central Ave., Diliman, Quezon City. The station operates regularly from Monday to Sunday from 4:00AM to 12:00MN. Since 2015, there was no broadcast breaks during the Summer Break (known by most non-Iglesia Ni Cristo members as the Holy Week) and continues broadcasting OPM songs due to its popularity.

History

Diamond 95.5 (1987–1992)

From 1987 to 1992, the station was launched under the brand Diamond 95.5. It played mainstream music.

Pinoy Radio DM 95.5 (1992–2002)

In 1992, it changed its name to Pinoy Radio DM 95.5 (ninety-five-five). Its format featured OPM. It was also one of the first radio stations with DJs that spoke a mix of Filipino and English. It also launches the Pinoy Music Awards where OPM artists and songs are recognized. The station lasted for 10 years until it went off the air in 2002.

Wavelength-division multiplexing

In fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths (i.e., colors) of laser light. This technique enables bidirectional communications over one strand of fiber, as well as multiplication of capacity.

The term wavelength-division multiplexing is commonly applied to an optical carrier (which is typically described by its wavelength), whereas frequency-division multiplexing typically applies to a radio carrier (which is more often described by frequency). Since wavelength and frequency are tied together through a simple directly inverse relationship, in which the product of frequency and wavelength equals c (the propagation speed of light), the two terms actually describe the same concept.

WDM systems

A WDM system uses a multiplexer at the transmitter to join the several signals together, and a demultiplexer at the receiver to split them apart. With the right type of fiber it is possible to have a device that does both simultaneously, and can function as an optical add-drop multiplexer. The optical filtering devices used have conventionally been etalons (stable solid-state single-frequency Fabry–Pérot interferometers in the form of thin-film-coated optical glass).