光貿易株式会社
〒113-0034
東京都文京区湯島3-13-8
湯島不二ビル301
電話番号：03-3832-3117
FAX番号 ：03-3832-3118
Optoplex Corporation社
 |
■メーカーの紹介 |
 |
|
|||||||||||||||
| ■製品概要／Product Overview | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Differential Quaternary Phase-Shift Keying (DQPSK) is the four-level version of DPSK. DQPSK transmits two bits for every symbol (bit combinations being 00, 01, 11 and 10) and has an additional advantage over conventional binary DPSK. DQPSK has a narrower optical spectrum, which tolerates more dispersion (both chromatic and polarization-mode), allows for stronger optical filtering, and enables closer channel spacing. As a result, DQPSK is the only modulation format which allows processing of 40Gb/s data-rate in a 50-GHz channel spacing system. With DQPSK, the bandwidth of the drive electronics needs only be half of the bit rate. So 43 Gb/s signals can be generated with 21.5 Gb/s equipment. This allows system providers to achieve the expanded flexibility of reducing system cost by using low-speed drive electronics. Optoplex's Optical DQPSK demodulator converts quadratural phase modulation into amplitude modulation over the entire C+L band in support of data transmission rate of 10 or 40 Gb/s. DQPSK demodulator is designed for the next generation optical communications systems utilized in commercial, defense and space exploration markets. The device plays a key role in improving signal quality and performance to meet the expanding d  mand for higher data rates and more complex transmission formats within current and next generation systems without major capital expenditure.DQPSK demodulator uses half the transmission rate to achieve the same data rate (20-Gb/s system for 40-Gb/s data rate, with four phase states instead of two in DPSK format) Lower transmission rate saves cost on many other components and electronics and is more tolerate of dispersion 20-Gb/s system is the highest transmission rate possible for the 50-GHz channel spacing Optoplex’s DQPSK demodulator currently provides a convenient solution for this application by using two matched DPSK demodulators with phase off-set at ± π/4. The co-packaged single-core DQPSK demodulator is also under development
1. Values listed are typical examples, customer can specify. 2. Over the stated spectral and operating temperature ranges and all polarization states. 3. Defined as the time required to reach half-way from the starting and ending points. 4. Not including five collimator sleeves extending from one longer side by 21 mm. |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
PDFファイル： 72 kb |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| ■特徴／Key Features |
| - Athermal design - C+L band coverage by a single device - Low temperature-dependent frequency shift (TDFS) - Low polarization-dependent frequency shift (PDFS) - Wide bandwidth - Low insertion loss & PDL - High power handling - Passive, semi-tunable and fully tunable operation - Suitable for both RZ and NRZ modulation format - Telcordia GR-1221 qualified |
| ■アプリケーション／Application |
| - 5 or 20 Gb/s DQPSK Signal Reception - Data Rate Optimization - Extend Transmission Distances |