This transmission device is now being introduced globally with initial sampling of the micro ITLA. In addition to meeting the industries’ demand for much lower power consumption and high optical output, Furukawa has also developed a new wave length tunable laser chip that enables an additional 20% reduction in power consumption. When used in combination with the micro ITLA, it further reduces power consumption by 40% against conventional products and nearly doubles the optical output when compared with micro ITLA. These benefits along with the acceptance of the Optical Internetworking Forum (OIF) to standardize the ITLA specification make the micro ITLAs an attractive choice for optical communication devices. The new wave length tunable laser chips are planned to be mounted on the micro ITLA devices beginning in early 2014.
Presently, global network traffic continues to grow at a phenomenal rate in both terrestrial and wireless networks. With smartphones now a ubiquitous tool for consumers and business users, acceptance of cloud computing, data center connectivity and mass video distribution, the telecommunications industry is presently accelerating the deployment of 100 Gb/s transmission systems for high capacity. The industry has converged on optical digital coherent technology in transmission systems, which involves the use of optical phases (wave conditions) resistant to signal deterioration and impervious to the effects of noise.
Furukawa has already commercialized high-output and narrow-line-width ITLAs that exhibit excellent properties for signal lights from the optical digital coherent system (Note 1) and for local oscillator (Note 2). Since the industry continues to demand higher capacity, the specifications for small and low power-consumption ITLAs have now been accepted and standardized by the OIF (Note 3).
The micro ITLA is a light source that has been made smaller, consuming less electricity while retaining the same specifications of conventional ITLAs that the industry is used to. These specifications include communications protocol and optical-electric properties.
Using its innovative history and manufacturing prowess, Furukawa has developed technologies for assembling and fixing high-accuracy optical components for manufacturing micro ITLAs (half the size or less compared to conventional ITLAs, 45 x 20 mm). A small package module has been developed by harnessing these technologies. Furukawa’s expertise in laser driver circuits and digital circuits has also been exercised to reduce the form factor.
The new wave length tunable laser chips from Furukawa can reduce power consumption by 20% from 5 W to 4 W. Currently available conventional lasers use GaInAsP crystals as active layers of the lasers. However, the optical output is reduced significantly at higher temperatures requiring cooling operation below room temperature. Furukawa’s new wave length tunable laser chips use AlGaInAs crystals (Note 4) for the light-emitting layer. By using this material, Furukawa has achieved better control of the optical output at higher temperatures improving it to 16 dBm or higher compared with 13.5dBm of conventional GaInAsP products. In addition, new wavelength tunable laser chips also increases the operating temperature by 15 degrees Celsius higher than conventional products, thus reducing the power consumption on the TEC (Note 5) and even lower when used on the micro ITLA (up to 40% compared to conventional products).
Item / Specifications of micro ITLAs / Specifications of conventional ITLAs
Wave length variable width / 1528 1564 nm (C-band) 1570 | 1607 nm (L-band) / 1528 1564 nm (C-band) | 1570 1607 nm (L-band)
Optical output / 13.5 dBm (1st release) | 16 dBm (with new chip) / 13.5 dBm or greater
Line width / < 500 kHz / < 500 kHz
Side mode suppression ratio / > 4 0dB / > 40dB
Average relative intensity noise / < -140 dB/Hz / < -140 dB/Hz
Wave length stability / < ±2.5 GHz | < ±2.5 GHz
Power consumption / 5 W / 6.5 W
Size / 45 x 20 x 7.5 mm / 74 x 30.5 x 10.5 mm
Note 1: Optical digital coherent system Involving the use of digital signal processing to detect optical phase information from transmitted data, the system is capable of transmitting a large volume of information within a narrow bandwidth.
Note 2: Local oscillator In the optical digital coherent system of transmission, this kind of light is locally used to facilitate interference with signal lights to obtain phase information from the transmitted data. This requires a narrow line width.
Note 3: OIF Optical Internetworking Forum is an industry group that endorses the standardization of optical network devices and their optical components.
Note 4: AlGaInAs This material makes it possible to create lasers that control the lowering of output even at high temperatures, compared to the conventional GaInAsP. As it contains Al which is oxidized readily, it is generally considered difficult to apply AlGaInAs to integrated-type optical elements that are produced through complicated processes.
Note 5: TEC Thermoelectric Cooling Module This module carries out heat generation and heat absorption by passing a current to the portion connecting two thermal electronic materials. It is used for adjusting the temperature of the laser chips in this product.
About Furukawa Electric Company, Ltd
Furukawa Electric Co. Ltd (furukawa.co.jp/english) is an $11 billion global leader in the design, manufacture and supply of fiber optic products, network products, electronics components, power cables, nonferrous metals, and other advanced technology products. Headquartered in Tokyo, Japan, Furukawa operates production facilities on five continents around the globe, including OFS in the USA, Europe and China.
OFS (ofsoptics.com) is a world-leading designer, manufacturer and provider of optical fiber, optical fiber cable, FTTX, optical connectivity and specialty photonics products. Our marketing, manufacturing and research divisions listen to customers and work together to provide innovative products and solutions that traverse many different applications as they link people and machines worldwide. Between continents, between cities, around neighborhoods, and into homes and businesses of digital consumers we provide the right optical fiber, optical cable and components for efficient, cost-effective transmission.
OFS’ corporate lineage dates back to 1876 and includes technology powerhouses such as AT&T (NYSE: T) and Lucent Technologies (now Alcatel-Lucent, NYSE: ALU). Today, OFS is owned by Furukawa Electric, a multi-billion dollar global leader in optical communications. Headquartered in Norcross (near Atlanta) Georgia, U.S., OFS is a global provider with facilities in Avon, Connecticut; Carrollton, Georgia; Somerset, New Jersey; and Sturbridge, Massachusetts, as well as in China, Denmark, Germany and Russia.
For more information, please visit specialtyphotonics.com/.
Technical Contact: Takahiro Okada, Furukawa Electric