Telekom Malaysia Berhad

Telekom Malaysia Behad

Romli Mohamad

Asmahanim Bte Ahmad

Syamsuri Yaakob

Norhakimah Md Samsuri

Mohamed Razman Yahya

Amiza Rasmi

Norhapizin Kushairi

Mohd Azmi Ismail

Mohamed Razman Bin Yahya

Mohd Adzir Mahdi

Abdullah Bin Man

Muhammad Zamsuri Bin Abdul Kadir

Yu Gang Shee

Wan Razli Wan Abdullah

Muhammad Zamzuri Abdul Kadir

The present invention relates to a system for interoperating a full-duplex radio-over-fiber (RoF) network in a fiber-to-the-home (FTTH) network and to a method associated with the system. The system comprises, at the central station (), a laser diode (), a first optical circulator (), an optical carrier generating unit (), and a second optical circulator (). The system comprises, at a base station (), a third optical circulator () a band pass filter () coupled to the third optical circulator () and configured to select only the optical signal having a corresponding pass band in which is used for converting an uplink signal as a remote local oscillator signal. The unselected optical signal is transmitted as downlink data.

System and method for interoperating a radio-over-fiber based network in a fiber-to-the-home network

A system () for generating a millimeter wave signals from heterodyning wavelengths from a multi-wavelength signal generated by a Brillouin-Erbium fiber laser (). The Brillouin-Erbium fiber laser () includes a source laser () that transmits a seed signal. An optical directional coupler () has a first input that receives the seed signal from the source laser and a first output. An Erbium doped fiber amplifier () has an input connected to the first output of the optical directional coupler and an output. The Erbium doped fiber amplifier amplifies the seed signal. A four port circulator () has a first port that receives the seed signal from the Erbium doped fiber amplifier. A Brillouin gain medium () is connected to a second port and a third port of the circulator. The seed signal propagates through the Brillouin gain medium in a first direction and a first order Stokes signal propagates through the Brillouin gain medium in a second direction to generate a second order Stokes signal propagating in the first direction. A fourth port of the circulator is connected to a second input of the optical directional coupler. The optical directional coupler receives the signal from the fourth port of the circulator and outputs a portion of the signal to a first output and a second portion to a second output of the optical directional coupler. Two wavelengths from the second output are then received by a photodiode () that heterodynes the signal to generate a millimeter wave signal.

All-optical generation of 60 GHz millimeter wave using multiple wavelength Brillouin-Erbium fiber laser

An apparatus and method for generating a millimeter-wave carrier signal for optical data transmission is disclosed. The apparatus includes stimulated Brillouin scattering source () that generates a variable stoke line multi-wavelength optical signal, optical amplifiers (), an optical splitter () that splits the amplified output of the SBS source () into two identical optical signals of the same magnitude, frequency, phase and electromagnetic mode, identical optical tuneable band-pass filters () with the same band-pass, an optical coupler () that combines the optical signals emitted from the output of the optical filters () such that the output of the coupler () is a dual wavelength optical signal with a wavelength separation equivalent to the desired millimeter wave frequency, a photo-detector () that converts the optical signal to an electrical signal by heterodyning process, and a controller circuit () that controls the gain of the optical amplifiers (), the tuning of the optical band-pass filters () independently and the number of stoke lines produced by the stimulated Brillouin scattering source () depending on the electrical millimeter wave output.

Stable millimeter wave source for broadband wireless signal transmission using optical fibre

Growing community of inventors

Selangor Darul Ehsan, Malaysia

Romli Mohamad