Telekom Malaysia Berhad

Telekom Malaysia Behad

Asmahanim Bte Ahmad

Syamsuri Yaakob

Romli Mohamad

Zulhedry Abdul Manaf

Mohamed Razman Yahya

Norhakimah Md Samsuri

Wan Razli Wan Abdullah

Dress Andriyanto M Ssi

Muhammad Zamzuri Abdul Kadir

Ummi Supya Binti Ismail

Dedy Tarsono

Mohamed Razman Bin Yahya

Mohd Adzir Mahdi

Yu Gang Shee

Muhammad Zamzuri Bin

Mohd Shahril Bin Salleh

Drees Andriyanto

Abdullah Bin Man

Muhammad Zamsuri Bin Abdul Kadir

This disclosure describes a wavelength division multiplexing passive optical network system () comprising an optical line terminal () for controlling transmission of data that are carried by optical signals across the optical network system along an upstream or downstream path; a signal modulating loop circuit including a circulator () connected to the optical line terminal () for determining the transmission paths of the optical signals; a splitter () connected to the circulator () for splitting the optical signals into a first portion of optical signals and a second portion of optical signals according to a predetermined ratio; an amplifier () connected to the splitter () for amplifying the second portion of optical signals; and a modulator () connected in between the amplifier () and the splitter () for modulating the amplified second portion of optical signals to be transmitted to the circulator (); a converter () connected to the splitter () for converting the first portion of optical signals into electrical signals; and one or more optical network units () connected in between the converter () and modulator () for receiving the electrical signals from the converter (), and transmitting electrical signals to the modulator () for converting the electrical signals into optical signals to be transmitted together with the amplified second portion of optical signals to the optical line terminal (); wherein the circulator () directs the optical signals received from the modulator () to the splitter () for being transmitted back into the signal modulating loop circuit and/or towards the optical network units along the downstream path, or towards the optical line terminal along the upstream path.

Wavelength division multiplexing passive optical network system

The present invention provides an improved optical communication network () that utilizes an apparatus of optical channel protection. The apparatus for optical channel protection of the present invention including a transmitting end network switch (), a first and a second receiving end network switch (), a plurality of wavelength tuneable transmitting end transponders (), a plurality of wavelength tuneable receiving end transponders ('), a transmitting end controller () connected to a network monitoring and control system () and a receiving end controller () connected to said network monitoring and control system (). The present invention utilizes a method of optical channel protection that can be broadly categorized under optical multiplex switching.

Broadband optical communication network having optical channel protection apparatus

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

Seri Kembangan, Malaysia

Asmahanim Bte Ahmad