Optical modulation module

A technology of optical modulation and phase modulator, applied in the field of optical communication, can solve problems such as high attenuation, achieve the effects of reducing attenuation, simplifying the structure, and reducing the number

Inactive Publication Date: 2016-11-09
HUAZHONG UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides an optical modulation module, the purpose of which is to solve the problems caused by multiple optical modulators when the existing modulation technology uses multiple optical modulators to generate FSK / ASK signals. high attenuation problem

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Embodiment Construction

[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0040] The functional block diagram of the optical modulation module provided by the embodiment is as follows figure 1 As shown, it includes a cosine signal generator 1, a first signal generator 2, a second signal generator 3, a multiplier 4, a 90° phase modulator 5, a laser 6, and a dual parallel modulator 7;

[0041] Wherein, the signal input end of 90° phase modulator 5 is connected to the fir...

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Abstract

The invention discloses an optical modulation module. According to the optical modulation module, FSK / ASK (Frequency Shift keying / Amplitude Shift Keying) orthogonal modulation signals can be produced for signal and label transmission. The module comprises a laser, a double-parallel modulator, a 90-degree phase modulator, a cosine signal generator, a multiplier and two signal generators. One signal generator generates a Manchester signal. The other signal generator generates bipolar NRZ codes. The cosine signal generator generates two ways of cosine signals. One way of cosine signal generates a first control signal after 90-degree phase modulation is carried out on the cosine signal by the Manchester signal. The other way of cosine signal is taken as a second control signal. The bipolar NRZ codes and the Manchester signal are multiplied to generate a third control signal. Under the modulation of the three ways of control signals, the double-parallel modulator modulates the laser output by the laser, thereby generating FSK / ASK signals. Compared with an existing FSK / ASK modulation system with at least two optical modulators, the modulation module provided by the invention has the advantages that only one optical modulator is applied, the structure is simple, attenuation can be reduced, and the transmission performance can be improved.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and more specifically relates to an optical modulation module. Background technique [0002] Modulation formats in optical communication include ASK (Amplitude Shift Keying, amplitude keying) modulation based on amplitude modulation, PSK (Phase Shift keying, phase keying) modulation based on phase modulation, and FSK (Frequency Shift keying, frequency shift keying) based on frequency modulation keying) modulation, and polarization-based polarization modulation. The orthogonal modulation format FSK / ASK uses two modulation methods of FSK and ASK to carry the payload and label respectively, and has attracted more and more attention because of its good transmission performance and independence of modulation and demodulation. [0003] The prior art is to modulate the FSK signal and the ASK signal separately, using at least two optical modulators, and adopting a step-by-step modulation m...

Claims

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Application Information

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IPC IPC(8): H04B10/548H04B10/556H04B10/69
CPCH04B10/548H04B10/5561H04B10/5563H04B10/6911
Inventor 罗风光杨柳
Owner HUAZHONG UNIV OF SCI & TECH
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